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Ask your friend if he wants to kill the cripples. How about those with a birth defect. Left-handers?
They're all biologically improbable - cripples, birth defects are obvious. Left handers are also biologically improbable because being left handed does not give them any distinct advantage over a right hander, so why would that mutation have survived?
The point, of course, is that yes, homosexuality is biologically improbable - it certainly doesn't enhance a species' survival chances if some of its members won't mate with the opposite sex and therefore have kids. However, just because something is biologically improbable does not mean it is immoral, wrong, or bad. It also does not mean that we should pass laws against it - unless of course he also wants to deny the right of deaf people to marry.
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