Horses and Donkeys don't normally mate, but raise one with the other and they will.
Maybe this be a clue to that homosexuality is not due to passing on homosexual genes, but maybe in the upbringing of that individual, and the choices made by him/her.
Men became scientific because they expected Law in Nature, and they expected Law in Nature because they believed in a Legislator. In most modern scientists this belief has died: it will be interesting to see how long their confidence in uniformity survives it. Two significant developments have already appeared”the hypothesis of a lawless sub-nature, and the surrender of the claim that science is true. We may be living nearer than we suppose to the end of the Scientific Age.’
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Lewis, C.S., Miracles: a preliminary study, Collins, London, p. 110, 1947.