In human sexuality, bisexuality describes people who are sexually and/or romantically attracted to both males and females.
In botany, a bisexualflower is one that possesses both male (pollen-producing) and female (seed-producing) parts. Botanists call these flowers perfect or hermaphroditic. Species that possess separately sexed (unisexual) flowers, but have both types on the same indiviudual plant are called monoecious.
Some non-human animal species also exhibit bisexual behavior. This is particularly common in hermaphroditic animals, but is also known in some other species (the bonobo being the most notorious example).
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