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>ITT People show they have no idea how human sexual practices from Ugga Bunga days continue to influence behavior due to the selection for these traits.
In all seriousness, it's likely that the traits that predispose women towards lesbianism/Bisexuality, also tend to be useful in entertainment industries. Not to mention the fact that this population isn't representative of the general public, so there can be much higher amounts of lesbians/bisexuals than what the general public numbers would indicate.