Vibrator (device designed to stimulate a woman's genitals).
Back-of-the-book; denoting those stamps in a catalogue that are not used for the payment of regular postage fees, and are displayed separately in the catalogue after that listing; the division between these two groups varies with the publisher.
Genitalia: a penis or vagina.
A category into which sexually-reproducing organisms are divided on the basis of their reproductive roles in their species.
Another category, especially of humans and especially based on sexuality or gender roles.
The distinction and relation between these categories, especially in humans; gender.
The members of such a category, taken collectively.
Sexual activity, usually sexual intercourse unless preceded by a modifier.
To determine the sex of (an animal).
To have sex with.
To have sex.