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Sure, Zyr. When in times of economic stress (doesn't apply to our current society as much, but it could in the future if we ever regress) having a homosexual in the family is another "helper" (anything from farming, to helping around the house) that doesn't have offspring to care for. Meaning you increase your immediate genes (very similar to your own) survival rate through dry periods (like when theres not enough food.) It's a round about way of continuing your genes through natural selection without producing any direct offspring. The selective advantage in this case is a family unit that has an extra adult helper free of the extra burden of offspring. Homosexuals would also be more likely to stay in the family, rather than leaving, since they don't need to be married off.
There have even been suggestions that when we start to overpopulate the homosexual population rises, because we've evolved to "know" when times of stress are likely to occur in the future.
So I didn't say that perfectly, it's been awhile since I learned about it, but that's the gist of it.
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