| Fornication | Sex between two unmarried persons.
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| Victorian compromise | The decision not to criminalize behavior per se and instead criminalize conduct that is visible to the outside world.
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| Rape | Nonconsensual oral, anal, or vaginal penetration, obtained by force, by threat of bodily harm, or when the victim is incapable of giving consent.
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| Incest | Sexual relations between persons closely related to each other.
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| Cohabitation | Unmarried persons living together (with sexual relations assumed).
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| Adultery | Intercourse involving persons at least one of whom is married to someone else.
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| Sodomy | Originally "crimes against nature"; in contemporary laws, oral and anal intercourse.
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| Exhibitionism | Showing one's genitals in a public place, to passersby; indecent exposure.
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| Voyeurism | Secretly watching people who are nude.
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| Prostitution | The exchange of sex for money or other payment such as drugs.
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| Obscenity | That which is offensive to decency or modesty, or calculated to arouse sexual excitement or lust.
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| Decriminalization | Removing an act from those prohibited by law, ceasing to define it as a crime.
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