A homosexual is someone who is sexually attracted exclusively to members of the same sex. It may apply to males or females, though the term lesbian is usually used for females.
Use of the term is complicated by the transgendered, whose sexual orientation does not fit the ordinary categories, and by those who are transitioning or have completed their transition to the opposite sex physically.
Homosexuals often find less adverse reaction in the alternative sex community than in most conventional society. In part this is because they are a substantial portion of the alternative sex community, but it is also in part because the homosexual rights movement of the last two or three decades has pioneered public acceptance of alternative sex orientations and practices.