When two or more people use each other for sex. It is considered ok, because all of the parties consent to being used and in turn use the other parties involved. There are no feelings involved in mutual usage; it's just for kicks.

Referring to women who are sexually or romantically attracted to other women. Applies to both lesbians and bisexual women, as it is only the same-sex attraction that matters, not any other attractions the women may have.

Originates from the Greek poet Sappho, a bisexual woman from the Isle of Lesbos, from which we get the term lesbian.