Wasteland said:

Species dont simply survive better of of traits that let them breed and consume.

Think of this, a herd of some animal is 100% heterosexual and prone to constant mating. Within a few generations this herd will have eaten all of its food and will have taken all the space they could possibly have. This species dies out from starvation.

The nearby herd has the frequent homosexual among its group, and doesnt multiply so quickly. Due to this, it have bountiful resources and continues on for millions of years.

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Good point!

Quote:

Sexual intercourse plays a major role in Bonobo society, being used as a greeting, a means of conflict resolution and post-conflict reconciliation, and as favors traded by the females in
exchange for food. Bonobos are the only non-human apes to have been observed engaging in all of the following sexual activities: face-to-face genital sex (most frequently female-female, then
male-female and male-male), tongue kissing, and oral sex.[2] In scientific literature, the female-female sex is often referred to as GG rubbing or genital-genital rubbing, while male-male sex is
sometimes referred to as penis fencing.

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Quote:

So together, he says, the “maternal” and “immune” effects only account for 21% of male homosexuality, leaving 79% of the causation still a mystery.

This leaves a major role for environmental factors, or perhaps more genetic factors. “Genes must develop in an environment, so if the environment changes, genes go in a new direction,” he says.
“Our findings are only one piece in a much larger puzzle on the nature of human sexuality.”

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Quote:

Moonshoe said:Another obvious possibility that someone else mentioned is simply that sexual preference is not genetic. But one wonders how "lifestyle or upbringing" could produce
homosexuality in birds, for
example.

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