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RE: Trying to find "the cause of homosexuality." Who says their is one cause? I personally think there are about six causes.
Based on simple observation, I have seen people who appear to be near hermaphroditic or asexual. For them, I have no trouble believing that there may be some genetic root.
Having lived in the middle east where homosexuality is rampant, I don't buy a "genetic cause." Guys do each other there because their options are limited, unless they are married.
In Greece, it was probably more prevalent because it was socially acceptable.
And I am also convinced that there are a good number who wound up in the lifestyle because of molestation, recruitment, or Freudian-basd reasons.
And, for now, mimicking lesbians seems to be a trend with young girls.
There may be a dozen reasons. Who knows? For most of the animal kingdom, sexual attraction is based on scent. Maybe the answer is somewhere up in the sinuses for all we know.