Sex

Many species of living things exist in two or more forms that combine genetic material in order to reproduce. This is called sexual reproduction. Typically, a species will have two forms, called male and female (the female being the one that produces the larger gamete). Fungi and some other organisms exist in more than two sexes, but still reproduce in pairs (any two differing sexes may reproduce). The word sex is also used to refer to sexual intercourse, the physical acts related to sexual reproduction. Some species are capable of both sexual and asexual reproduction.

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Human sexuality

Bisexuality

Heterosexuality

Homosexuality

Sexology

Paraphilias

[Sex education]?

Birth control

Abortion

Contraception

Sexually transmitted diseases

Acquired Immunodeficiency Syndrome -- commonly referred to as AIDS

Herpes?

Syphilis

Gonorrhea?

[Artistic depictions of sex]?

Erotica

Pornography

[Religious views on sex]?

Fetish

[Sex crime]?

Rape or sexual assualt

Child sexual abuse or molestation

Incest

[Lust murder]?

[Sex humor]?

Trysexual