Because its not inclined by nature.
That along people are scared of breaking the norm of typical and widespread taboo in the light of others
[spoiler]theyre pretty gay[/spoiler]
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It isn't, but you have animals that show homosexual tendencies. Regardless we have more than a couple billion people on earth, I don't think being gay will decrease population growth substantially. [spoiler]Lions are a prime example[/spoiler]