Originally posted by: SirStev0
Originally posted by: Cerpin Taxt
Evolution operates on populations, not individuals.
Theoretically, if there are certain genes that cause men to be exclusively attracted to only men, then yes the population should push to losing these genes as they would make the individual unable to breed. However, as someone already pointed out, homosexuality seems to act more like eye color which is multifactorial and has hundreds of different combo's working together in each person than for instance attached ears, which follows simple mendelian.
With that said, social pressures to live in "heterosexual" relationships would contribute to maintaining any genes that would cause same sex attraction.