Re: How can gayness have a genetic basis?
Why can't sexuality be both genetic and social (i.e. nature and nurture)? And why is it not plausible that people are on a gay-straight sexuality scale (where most people are generally straight to support/encourage sexual reproduction)? In other words, people are bisexual by nature favoring sexuality toward one pole or another (pun intended) and rare for someone have exactly, or near, equal preference. (I've dated women that have this profile tending to prefer men but having an occasional dating relationship with women.)
It's also more fashionable for women to exhibit lesbian tendencies in our society right now. Some women do it to attract attention from men alone. Women also seem much more fluid, and men rigid, when it comes to their sexuality.
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