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A lesbian is a woman who is romantically or sexually attracted only to other women.
Women who are attracted to both women and men are more often referred to as bisexual. An individual's self-identification might not correspond with her behavior, and may be expressed with either, both, or neither of these words.
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Sexual activity between women is as diverse as sex between heterosexuals or gay men. Some women in same-sex relationships do not identify as lesbian, but as bisexual, queer, or another label. As with any interpersonal activity, sexual expression depends on the context of the relationship.
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Read more Lesbians
And what is Lesbophobia?