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TimB said:  For all we know a rise in sexualities beyond heterosexuality is the natural course of nature in contingencies of overcrowding, chaos, and stress.

Oneguy said: That’s an old theory which implies a teleological aspect to nature, but we know nature doesn’t work that way.

TimB replies:  My statement doesn’t need to imply that nature could create off brand sexualities in order to account for contingencies.  That indeed, is not how nature works.  Nature can’t decide, hmm, too much crowding, chaos, and stress, I guess I better cook up some alternate sexualities.

But what could conceivably happen in the course of natural events is that populations that were too successful in growing, to the point that the excess threatened the whole, then in the long course of history, the populations that declined naturally, by virtue of sexualities alternate to heterosexuality, may have survived better than ones that continued whole hog reproduction.

Easter Island is an example of a population that was too successful for their contingencies.  If a lot of them had become homosexual, maybe they would not have been overpopulated to the point that they wiped out their civilization.