Back in the Dark Ages when psychiatrists classed homosexuality as a mental illness, they attributed its existence to environmental factors – domineering mother, weak-willed father, etc. Nowadays everybody but open homophobes seems to have accepted the theory that homosexuality is an innate characteristic – you’re gay because you were born gay.
Presumably – perhaps someone can correct me on this point – INNATE in this context means HEREDITARY, something you got from your parents. But how can homosexuality be hereditary? True, homosexuals do sometimes have children, but they’re much, much less likely to do so than straight people are. If there were such thing as a “gay gene,” wouldn’t it naturally be bred out of existence in a few generations?