62 - Revision history

NBBot: Eugen Grebenik et al., first edition 1958

2010-02-11T05:00:37Z

Eugen Grebenik et al., first edition 1958

NBBot: Eugen Grebenik et al., first edition 1958

2010-02-02T14:49:33Z

Eugen Grebenik et al., first edition 1958

NBBot: Eugen Grebenik et al., first edition 1958

2009-11-07T17:20:08Z

Eugen Grebenik et al., first edition 1958

NBBot: Eugen Grebenik et al., first edition 1958

2009-10-21T10:46:43Z

Eugen Grebenik et al., first edition 1958

NBBot: Eugen Grebenik et al., first edition 1958

2009-10-21T09:08:55Z

Eugen Grebenik et al., first edition 1958

NBBot: Eugen Grebenik et al., first edition 1958

2009-10-19T19:04:02Z

Eugen Grebenik et al., first edition 1958

New page

{{CurrentStatus}}
{{Unmodified edition I}}
{{Summary}}
__NOTOC__

=== 620 ===

The {{TextTerm|reproductive period|1|620|OtherIndexEntry=period, reproductive}} (or in women the {{TextTerm|childbearing period|1|620|2|OtherIndexEntry=period, childbearing}}) begins at {{TextTerm|puberty|2|620}}. {{TextTerm|Menstruation|3|620}}—the appearance of the {{TextTerm|periods|4|620|IndexEntry=period}} or {{TextTerm|menses|4|620|2}} in women—also begins at puberty. The first period is called the {{TextTerm|menarche|5|620}} and menstruation ceases with the {{TextTerm|menopause|6|620}}, which is also sometimes called the c{{TextTerm|limacteric|6|620|2|IndexEntry=climacteric}}. The absence of menstruation (e.g. after childbirth) is called {{TextTerm|amenorrhoea|7|620}}.
{{Note|3| {{NoteTerm|menstruation}} n. — {{NoteTerm|menstruate}} v. — {{NoteTerm|menstrual}} adj.}}
{{Note|6| {{NoteTerm|menopause}} n. — {{NoteTerm|menopausal}} adj. The expression {{NoteTerm|change of life}} is used as a synonym for menopause in colloquial language.}}

=== 621 ===

The capacity of a man, a woman or a couple to participate in reproduction (i.e., the production of a live child) is called {{TextTerm|fecundity|1|621}}. The lack of that capacity is called {{TextTerm|infecundity|2|621}}, {{TextTerm|sterility|2|621|2}} or {{TextTerm|physiological infertility|2|621|3|OtherIndexEntry=infertility, physiological}}. {{TextTerm|Fertility|3|621}} ({{RefNumber|60|1|1}}) on the other hand means actual reproductive performance —whether applied to an individual or group. It should be noted that in many Latin languages, the etymological equivalents of fertility and fecundity are used in a sense diametrically opposite to that in English. Thus, the French {{NonRefTerm|fécondité}} or the Spanish {{NonRefTerm|fecondidad}} are properly translated by fertility, and {{NonRefTerm|fertilité}} or {{NonRefTerm|fertilidad}} by fecundity. It should also be noted that although the conventions outlined above are generally followed by demographers, the terms fertility and fecundity are used much more loosely in medical literature, where they are sometimes treated as being almost synonymous. {{TextTerm|Childlessness|4|621}} may be due to sterility, but like the word {{TextTerm|infertility|4|621|2}} includes both physiological infertility ({{RefNumber|62|1|2}}) and {{TextTerm|voluntary infertility|5|621|OtherIndexEntry=infertility, voluntary}} which is often inaccurately called {{TextTerm|voluntary sterility|5|621|2|OtherIndexEntry=sterility, voluntary}}.
{{Note|1| {{NoteTerm|fecundity}} n. — {{NoteTerm|fecund}} adj. The term {{NoteTerm|sub-fecundity}} when applied to an individual means that the capacity is below normal; it is also sometimes applied to a group of persons rather than to an individual.}}
{{Note|2| {{NoteTerm|sterility}} n. — {{NoteTerm|sterile}} adj. — {{NoteTerm|sterilize}} v., to make sterile, {{NoteTerm|sterilization}} n., the operation of sterilizing. — {{NoteTerm|infecundity}} n. — {{NoteTerm|infecund}} adj.}}
{{Note|3| {{NoteTerm|fertility}} n. — adj. {{NoteTerm|fertile}}. The term {{NoteTerm|sub-fertility}} has been used to apply both to persons and to groups of low fertility, and also to groups which should properly be called sub-fecund, because their low fertility is due to physiological causes.}}
{{Note|4| {{NoteTerm|infertility}} n. — {{NoteTerm|infertile}} adj. — {{NoteTerm|childlessness}} n. — {{NoteTerm|childless}} adj.}}

=== 622 ===

A sterile couple cannot procreate a child. The sterility may be due to either or both partners and either or both may prove to be fecund with another mate. Among women we distinguish {{TextTerm|primary sterility|1|622|OtherIndexEntry=sterility, primary}} where the woman has never been able to have children, and {{TextTerm|secondary sterility|2|622|OtherIndexEntry=sterility, secondary}}, which arises after one or more children have been born. Sterility may bo permanent but there are also periods of {{TextTerm|temporary sterility|3|622|OtherIndexEntry=sterility, temporary}}. Women have {{TextTerm|sterile periods|4|622|IndexEntry=sterile period|OtherIndexEntry=period, sterile}} in each {{TextTerm|menstrual cycle|5|622|OtherIndexEntry=cycle, menstrual}} (cf. {{RefNumber|62|0|3}}*), because generally conception, can occur only during a few days around the time of {{TextTerm|ovulation|6|622}}. A woman is sterile throughout an {{TextTerm|anovular cycle|7|622|OtherIndexEntry=cycle, anovular}} (i.e., a cycle in which ovulation does not occur). A woman is also sterile from the {{NonRefTerm|end}} of pregnancy ({{RefNumber|60|2|5}}) to the resumption of ovulation, which usually occurs after the puerperium ({{RefNumber|60|3|6}}).

=== 623 ===

A couple’s fertility ({{RefNumber|62|1|3}}) will depend upon their fecundity ({{RefNumber|62|1|1}}) and their {{TextTerm|reproductive behaviour|1|623|OtherIndexEntry=behaviour, reproductive}}. A distinction is drawn between {{TextTerm|planners|2|623|IndexEntry=planner}} who attempt to regulate the number and spacing of their children, and {{TextTerm|non-planners|3|623|IndexEntry=non-planner}} who make no such attempt and whose fertility will depend entirely upon their sexual activity and fecundity. Some demographers use a broader definition of the term "planner" and include in this group couples who decide they wish to have as many children as possible as quickly as possible. In the narrower sense {{TextTerm|fertility planning|4|623|OtherIndexEntry=planning, fertility}} or {{TextTerm|family planning|4|623|2|OtherIndexEntry=planning, family}} consists in the {{TextTerm|restriction of births|5|623|OtherIndexEntry=births, restriction of}} or {{TextTerm|limitation of births|5|623|2|OtherIndexEntry=births, limitation of}}, either temporarily to achieve the desired interval between successive births or permanently to prevent more births than desired. The terms {{TextTerm|birth control|6|623|OtherIndexEntry=control, birth}}, {{TextTerm|voluntary parenthood|6|623|2|OtherIndexEntry=parenthood, voluntary}} or {{TextTerm|planned fertility|6|623|3|OtherIndexEntry=fertility, planned}} have been used.
{{Note|4| A classification by {{NoteTerm|fertility planning status}} distinguishes between the couples who have not tried to regulate the number and spacing of their children and those who have tried to do so, and subdivides the latter on the basis of the degree of success attained,}}

=== 624 ===

{{TextTerm|Contraception|1|624}}, strictly speaking, refers to measures excluding sterilization (and, in some discussions, permanent and periodic abstinence) which are taken in order to prevent {{TextTerm|sexual intercourse|2|624|OtherIndexEntry=intercourse, sexual}} or {{TextTerm|coitus|2|624|2}} from resulting in conception. A {{TextTerm|contraceptive method|3|624|OtherIndexEntry=method, contraceptive}} is sometimes called a {{TextTerm|birth control method|3|624|2|OtherIndexEntry=control method, birth}}, but the latter term is also used in a broader sense to include intentional abortion ({{RefNumber|60|4|2}}), sterilization ({{RefNumber|62|1|2}}*) and complete {{TextTerm|abstinence|4|624}} from coitus, which are not usually considered to be contraceptive methods. A specific type of periodic abstinence ({{RefNumber|62|5|6}}) is classified as a birth control method when this term is used in its broader meaning. Some demographers classify it as a contraceptive method, but others do not.
{{Note|1| {{NoteTerm|contraception}} n. — {{NoteTerm|contraceptor}} n., one who practises contraception.}}

=== 625 ===

A distinction is frequently drawn between {{TextTerm|appliance methods|1|625|IndexEntry=appliance method|OtherIndexEntry=method, appliance}} of contraception and {{TextTerm|non-appliance methods|2|625|OtherIndexEntry=method, non-appliance}}. The former make use of {{TextTerm|contraceptives|3|625|IndexEntry=contraceptive|OtherIndexEntry=device, contraceptive}} or {{TextTerm|contraceptive devices|3|625|2|IndexEntry=method, birth control}} which prevent the union of the sperm and the ovum, or of {{TextTerm|chemical contraceptives|4|625|IndexEntry=chemical contraceptive|OtherIndexEntry=contraceptive, chemical}} or {{TextTerm|spermicides|4|625|2|IndexEntry=spermicide}} which kill the sperm. One principal non-appliance method of contraception is {{TextTerm|coitus interruptus|5|625|IndexEntry=coitus interruptus}} or {{TextTerm|withdrawal|5|625|2}}. Another non-appliance method of contraception is {{TextTerm|periodic abstinence|6|625|OtherIndexEntry=abstinence, periodic}} or the {{TextTerm|rhythm method|6|625|2|OtherIndexEntry=method, rhythm}}, in which coitus-is avoided during the period when the woman is believed to be fecund and takes place only during the so-called {{TextTerm|safe period|7|625|OtherIndexEntry=period, safe}} of the menstrual cycle ({{RefNumber|62|2|5}}) when she is believed to be incapable of conceiving ({{RefNumber|60|2|1}} *). Some fertility planning couples ({{RefNumber|62|3|4}}) use the rhythm method to try to ensure a conception when wanted, i.e., they have intercourse during the period when ovulation is believed to occur.
{{Note|2| The Roman Catholic Church distinguishes also between {{NoteTerm|natural methods}} and {{NoteTerm|unnatural}}<br />{{NoteTerm|methods}} of contraception, with periodic abstinence classified as natural and all other methods as unnatural.}}

=== 626 ===

The appliance methods which are more commonly used to prevent the union of the sperm and the ovum include the {{TextTerm|condom|1|626}} or {{TextTerm|sheath|1|626|2}} used by men, and the {{TextTerm|diaphragm|2|626}} or {{TextTerm|pessary|2|626|2}}, {{TextTerm|cervical cap|2|626|3|OtherIndexEntry=cap, cervical}}, {{TextTerm|stem pessary|3|626|OtherIndexEntry=pessary, stem}}, {{TextTerm|tampon|4|626}} or {{TextTerm|sponge|4|626|2}} and {{TextTerm|douche|5|626}} used by women. The chemical contraceptives which are more commonly used by women as spermicides include the {{TextTerm|contraceptive jelly|6|626|OtherIndexEntry=jelly, contraceptive}}, {{TextTerm|cream|6|626|2}}, {{TextTerm|paste|6|626|3}} or {{TextTerm|suppository|6|626|4}} and {{TextTerm|foam tablets|7|626|IndexEntry=foam tablet|OtherIndexEntry=tablet, foam}} or {{TextTerm|foam powders|7|626|2|IndexEntry=foam powder|OtherIndexEntry=powder, foam}}. Certain of these methods are commonly used in combination with others, e.g. diaphragm and jelly.

{{SummaryShort}}

{{OtherLanguages|62}}

← Older revision		Revision as of 05:00, 11 February 2010
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		+	== 62 ==

@@ Line 15: / Line 15: @@
 === 621 ===
-The capacity of a man, a woman or a couple to participate in reproduction (i.e., the production of a live child) is called {{TextTerm|fecundity|1|621}}. The lack of that capacity is called {{TextTerm|infecundity|2|621}}, {{TextTerm|sterility|2|621|2}} or {{TextTerm|physiological infertility|2|621|3|OtherIndexEntry=infertility, physiological}}. {{TextTerm|Fertility|3|621}} ({{RefNumber|60|1|.1}}) on the other hand means actual reproductive performance —whether applied to an individual or group. It should be noted that in many Latin languages, the etymological equivalents of fertility and fecundity are used in a sense diametrically opposite to that in English. Thus, the French {{NonRefTerm|fécondité}} or the Spanish {{NonRefTerm|fecondidad}} are properly translated by fertility, and {{NonRefTerm|fertilité}} or {{NonRefTerm|fertilidad}} by fecundity. It should also be noted that although the conventions outlined above are generally followed by demographers, the terms fertility and fecundity are used much more loosely in medical literature, where they are sometimes treated as being almost synonymous. {{TextTerm|Childlessness|4|621}} may be due to sterility, but like the word {{TextTerm|infertility|4|621|2}} includes both physiological infertility ({{RefNumber|62|1|.2}}) and {{TextTerm|voluntary infertility|5|621|OtherIndexEntry=infertility, voluntary}} which is often inaccurately called {{TextTerm|voluntary sterility|5|621|2|OtherIndexEntry=sterility, voluntary}}.
+The capacity of a man, a woman or a couple to participate in reproduction (i.e., the production of a live child) is called {{TextTerm|fecundity|1|621}}. The lack of that capacity is called {{TextTerm|infecundity|2|621}}, {{TextTerm|sterility|2|621|2}} or {{TextTerm|physiological infertility|2|621|3|OtherIndexEntry=infertility, physiological}}. {{TextTerm|Fertility|3|621}} ({{RefNumber|60|1|1}}) on the other hand means actual reproductive performance —whether applied to an individual or group. It should be noted that in many Latin languages, the etymological equivalents of fertility and fecundity are used in a sense diametrically opposite to that in English. Thus, the French {{NonRefTerm|fécondité}} or the Spanish {{NonRefTerm|fecondidad}} are properly translated by fertility, and {{NonRefTerm|fertilité}} or {{NonRefTerm|fertilidad}} by fecundity. It should also be noted that although the conventions outlined above are generally followed by demographers, the terms fertility and fecundity are used much more loosely in medical literature, where they are sometimes treated as being almost synonymous. {{TextTerm|Childlessness|4|621}} may be due to sterility, but like the word {{TextTerm|infertility|4|621|2}} includes both physiological infertility ({{RefNumber|62|1|2}}) and {{TextTerm|voluntary infertility|5|621|OtherIndexEntry=infertility, voluntary}} which is often inaccurately called {{TextTerm|voluntary sterility|5|621|2|OtherIndexEntry=sterility, voluntary}}.
 {{Note|1| {{NoteTerm|fecundity}} n. — {{NoteTerm|fecund}} adj. The term {{NoteTerm|sub-fecundity}} when applied to an individual means that the capacity is below normal; it is also sometimes applied to a group of persons rather than to an individual.}}
 {{Note|2| {{NoteTerm|sterility}} n. — {{NoteTerm|sterile}} adj. — {{NoteTerm|sterilize}} v., to make sterile, {{NoteTerm|sterilization}} n., the operation of sterilizing. — {{NoteTerm|infecundity}} n. — {{NoteTerm|infecund}} adj.}}
@@ Line 23: / Line 23: @@
 === 622 ===
-A sterile couple cannot procreate a child. The sterility may be due to either or both partners and either or both may prove to be fecund with another mate. Among women we distinguish {{TextTerm|primary sterility|1|622|OtherIndexEntry=sterility, primary}} where the woman has never been able to have children, and {{TextTerm|secondary sterility|2|622|OtherIndexEntry=sterility, secondary}}, which arises after one or more children have been born. Sterility may bo permanent but there are also periods of {{TextTerm|temporary sterility|3|622|OtherIndexEntry=sterility, temporary}}. Women have {{TextTerm|sterile periods|4|622|IndexEntry=sterile period|OtherIndexEntry=period, sterile}} in each {{TextTerm|menstrual cycle|5|622|OtherIndexEntry=cycle, menstrual}} (cf. {{RefNumber|62|0|.3}}*), because generally conception, can occur only during a few days around the time of {{TextTerm|ovulation|6|622}}. A woman is sterile throughout an {{TextTerm|anovular cycle|7|622|OtherIndexEntry=cycle, anovular}} (i.e., a cycle in which ovulation does not occur). A woman is also sterile from the {{NonRefTerm|end}} of pregnancy ({{RefNumber|60|2|.5}}) to the resumption of ovulation, which usually occurs after the puerperium ({{RefNumber|60|3|.6}}).
+A sterile couple cannot procreate a child. The sterility may be due to either or both partners and either or both may prove to be fecund with another mate. Among women we distinguish {{TextTerm|primary sterility|1|622|OtherIndexEntry=sterility, primary}} where the woman has never been able to have children, and {{TextTerm|secondary sterility|2|622|OtherIndexEntry=sterility, secondary}}, which arises after one or more children have been born. Sterility may bo permanent but there are also periods of {{TextTerm|temporary sterility|3|622|OtherIndexEntry=sterility, temporary}}. Women have {{TextTerm|sterile periods|4|622|IndexEntry=sterile period|OtherIndexEntry=period, sterile}} in each {{TextTerm|menstrual cycle|5|622|OtherIndexEntry=cycle, menstrual}} (cf. {{RefNumber|62|0|3}}*), because generally conception, can occur only during a few days around the time of {{TextTerm|ovulation|6|622}}. A woman is sterile throughout an {{TextTerm|anovular cycle|7|622|OtherIndexEntry=cycle, anovular}} (i.e., a cycle in which ovulation does not occur). A woman is also sterile from the {{NonRefTerm|end}} of pregnancy ({{RefNumber|60|2|5}}) to the resumption of ovulation, which usually occurs after the puerperium ({{RefNumber|60|3|6}}).
 === 623 ===
-A couple’s fertility ({{RefNumber|62|1|.3}}) will depend upon their fecundity ({{RefNumber|62|1|.1}}) and their {{TextTerm|reproductive behaviour|1|623|OtherIndexEntry=behaviour, reproductive}}. A distinction is drawn between {{TextTerm|planners|2|623|IndexEntry=planner}} who attempt to regulate the number and spacing of their children, and {{TextTerm|non-planners|3|623|IndexEntry=non-planner}} who make no such attempt and whose fertility will depend entirely upon their sexual activity and fecundity. Some demographers use a broader definition of the term "planner" and include in this group couples who decide they wish to have as many children as possible as quickly as possible. In the narrower sense {{TextTerm|fertility planning|4|623|OtherIndexEntry=planning, fertility}} or {{TextTerm|family planning|4|623|2|OtherIndexEntry=planning, family}} consists in the {{TextTerm|restriction of births|5|623|OtherIndexEntry=births, restriction of}} or {{TextTerm|limitation of births|5|623|2|OtherIndexEntry=births, limitation of}}, either temporarily to achieve the desired interval between successive births or permanently to prevent more births than desired. The terms {{TextTerm|birth control|6|623|OtherIndexEntry=control, birth}}, {{TextTerm|voluntary parenthood|6|623|2|OtherIndexEntry=parenthood, voluntary}} or {{TextTerm|planned fertility|6|623|3|OtherIndexEntry=fertility, planned}} have been used.
+A couple’s fertility ({{RefNumber|62|1|3}}) will depend upon their fecundity ({{RefNumber|62|1|1}}) and their {{TextTerm|reproductive behaviour|1|623|OtherIndexEntry=behaviour, reproductive}}. A distinction is drawn between {{TextTerm|planners|2|623|IndexEntry=planner}} who attempt to regulate the number and spacing of their children, and {{TextTerm|non-planners|3|623|IndexEntry=non-planner}} who make no such attempt and whose fertility will depend entirely upon their sexual activity and fecundity. Some demographers use a broader definition of the term "planner" and include in this group couples who decide they wish to have as many children as possible as quickly as possible. In the narrower sense {{TextTerm|fertility planning|4|623|OtherIndexEntry=planning, fertility}} or {{TextTerm|family planning|4|623|2|OtherIndexEntry=planning, family}} consists in the {{TextTerm|restriction of births|5|623|OtherIndexEntry=births, restriction of}} or {{TextTerm|limitation of births|5|623|2|OtherIndexEntry=births, limitation of}}, either temporarily to achieve the desired interval between successive births or permanently to prevent more births than desired. The terms {{TextTerm|birth control|6|623|OtherIndexEntry=control, birth}}, {{TextTerm|voluntary parenthood|6|623|2|OtherIndexEntry=parenthood, voluntary}} or {{TextTerm|planned fertility|6|623|3|OtherIndexEntry=fertility, planned}} have been used.
 {{Note|4| A classification by {{NoteTerm|fertility planning status}} distinguishes between the couples who have not tried to regulate the number and spacing of their children and those who have tried to do so, and subdivides the latter on the basis of the degree of success attained,}}
 === 624 ===
-{{TextTerm|Contraception|1|624}}, strictly speaking, refers to measures excluding sterilization (and, in some discussions, permanent and periodic abstinence) which are taken in order to prevent {{TextTerm|sexual intercourse|2|624|OtherIndexEntry=intercourse, sexual}} or {{TextTerm|coitus|2|624|2}} from resulting in conception. A {{TextTerm|contraceptive method|3|624|OtherIndexEntry=method, contraceptive}} is sometimes called a {{TextTerm|birth control method|3|624|2|OtherIndexEntry=control method, birth}}, but the latter term is also used in a broader sense to include intentional abortion ({{RefNumber|60|4|.2}}), sterilization ({{RefNumber|62|1|.2}}*) and complete {{TextTerm|abstinence|4|624}} from coitus, which are not usually considered to be contraceptive methods. A specific type of periodic abstinence ({{RefNumber|62|5|.6}}) is classified as a birth control method when this term is used in its broader meaning. Some demographers classify it as a contraceptive method, but others do not.
+{{TextTerm|Contraception|1|624}}, strictly speaking, refers to measures excluding sterilization (and, in some discussions, permanent and periodic abstinence) which are taken in order to prevent {{TextTerm|sexual intercourse|2|624|OtherIndexEntry=intercourse, sexual}} or {{TextTerm|coitus|2|624|2}} from resulting in conception. A {{TextTerm|contraceptive method|3|624|OtherIndexEntry=method, contraceptive}} is sometimes called a {{TextTerm|birth control method|3|624|2|OtherIndexEntry=control method, birth}}, but the latter term is also used in a broader sense to include intentional abortion ({{RefNumber|60|4|2}}), sterilization ({{RefNumber|62|1|2}}*) and complete {{TextTerm|abstinence|4|624}} from coitus, which are not usually considered to be contraceptive methods. A specific type of periodic abstinence ({{RefNumber|62|5|6}}) is classified as a birth control method when this term is used in its broader meaning. Some demographers classify it as a contraceptive method, but others do not.
 {{Note|1| {{NoteTerm|contraception}} n. — {{NoteTerm|contraceptor}} n., one who practises contraception.}}
 === 625 ===
-A distinction is frequently drawn between {{TextTerm|appliance methods|1|625|IndexEntry=appliance method|OtherIndexEntry=method, appliance}} of contraception and {{TextTerm|non-appliance methods|2|625|OtherIndexEntry=method, non-appliance}}. The former make use of {{TextTerm|contraceptives|3|625|IndexEntry=contraceptive|OtherIndexEntry=device, contraceptive}} or {{TextTerm|contraceptive devices|3|625|2|IndexEntry=method, birth control}} which prevent the union of the sperm and the ovum, or of {{TextTerm|chemical contraceptives|4|625|IndexEntry=chemical contraceptive|OtherIndexEntry=contraceptive, chemical}} or {{TextTerm|spermicides|4|625|2|IndexEntry=spermicide}} which kill the sperm. One principal non-appliance method of contraception is {{TextTerm|coitus interruptus|5|625|IndexEntry=coitus  interruptus}} or {{TextTerm|withdrawal|5|625|2}}. Another non-appliance method of contraception is {{TextTerm|periodic abstinence|6|625|OtherIndexEntry=abstinence, periodic}} or the {{TextTerm|rhythm method|6|625|2|OtherIndexEntry=method, rhythm}}, in which coitus-is avoided during the period when the woman is believed to be fecund and takes place only during the so-called {{TextTerm|safe period|7|625|OtherIndexEntry=period, safe}} of the menstrual cycle ({{RefNumber|62|2|.5}}) when she is believed to be incapable of conceiving ({{RefNumber|60|2|.1}} *). Some fertility planning couples ({{RefNumber|62|3|.4}}) use the rhythm method to try to ensure a conception when wanted, i.e., they have intercourse during the period when ovulation is believed to occur.
+A distinction is frequently drawn between {{TextTerm|appliance methods|1|625|IndexEntry=appliance method|OtherIndexEntry=method, appliance}} of contraception and {{TextTerm|non-appliance methods|2|625|OtherIndexEntry=method, non-appliance}}. The former make use of {{TextTerm|contraceptives|3|625|IndexEntry=contraceptive|OtherIndexEntry=contraceptive device}} or {{TextTerm|contraceptive devices|3|625|2|IndexEntry=device, contraceptive}} which prevent the union of the sperm and the ovum, or of {{TextTerm|chemical contraceptives|4|625|IndexEntry=chemical contraceptive|OtherIndexEntry=contraceptive, chemical}} or {{TextTerm|spermicides|4|625|2|IndexEntry=spermicide}} which kill the sperm. One principal non-appliance method of contraception is {{TextTerm|coitus interruptus|5|625|IndexEntry=coitus  interruptus}} or {{TextTerm|withdrawal|5|625|2}}. Another non-appliance method of contraception is {{TextTerm|periodic abstinence|6|625|OtherIndexEntry=abstinence, periodic}} or the {{TextTerm|rhythm method|6|625|2|OtherIndexEntry=method, rhythm}}, in which coitus-is avoided during the period when the woman is believed to be fecund and takes place only during the so-called {{TextTerm|safe period|7|625|OtherIndexEntry=period, safe}} of the menstrual cycle ({{RefNumber|62|2|5}}) when she is believed to be incapable of conceiving ({{RefNumber|60|2|1}} *). Some fertility planning couples ({{RefNumber|62|3|4}}) use the rhythm method to try to ensure a conception when wanted, i.e., they have intercourse during the period when ovulation is believed to occur.
 {{Note|2| The Roman Catholic Church distinguishes also between {{NoteTerm|natural methods}} and {{NoteTerm|unnatural}}<br />{{NoteTerm|methods}} of contraception, with periodic abstinence classified as natural and all other methods as unnatural.}}