A common reason people refer to to support their belief that being gay is "wrong" is that gay sex doesn't produce a baby, therefore it's "unnatural." Now as you should know, straight vaginal sex is the only way 2 humans can make a baby.
With that said, that would mean all other sexual activities would be "unnatural" and therefore "wrong."
Anal? Unnatural
BJs? Unnatural
HJs? Unnatural
Fornicating with yourself also doesn't produce any offspring. This logic would also claim that the act of masturbation is unnatural and in turn, wrong.
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Having sex with a women who can't have kids would also be unnatural, using that logic. But it's stupid. Having sex does not mean you plan on or ever want to have a child. Plenty of ppl have sex simply for the pleasure. I would bet more ppl have sex for the pleasure then to have a child.