(psychology) A psychological complex involving fixations of a sexual nature; a fetish.

A physical difference between male and female individuals of the same species.

plural of sexual partner

(evolutionary theory) A type of natural selection where members of the sexes acquire distinct forms either because the members of one sex choose mates with particular features or because in the competition for mates among the members of one sex only those with certain traits succeed.

Coitus or genital-genital sexual contact. / Sexual interaction, usually involving vaginal and/or anal and/or oral penetration, between at least two organisms.

Sexual orientation.

One's tendencies of sexual attraction, considered as a whole.

(criminology) A criminal activity that involves forced sexual acts upon a person who is usually held hostage as a slave.

(health sciences, sexology) Knowledge required to advance and protect one's own sexual health and well-being.

Harassment in the form of unwelcome sexual advances.