Evolutionary psychology is always such a stretch, but I had never considered that possibility before. If there are a lot of extra males, if all were heterosexua

Evolutionary psychology is always such a stretch, but I had never considered that possibility before. If there are a lot of extra males, if all were heterosexual there could be destructive competition over female mates. So asexual/homosexual/etc may become selected for if a disproportionate number of males were in a community (still community resources as you say but not destructively competing for mates).