
Originally Posted by
LegioXXXUlpiaVictrix
Many species have birth control regulation to keep their numbers down, which is also important for survival. You can for instance see this clearly in species which are near extinct, they still don't breed like maniacs because their regulation mechanisms are still there. Actually most mammals have fairly good regulation, unlike fish and reptiles etc. It's likely that sex was even introduced by evolution for it's ability to regulate number of births, and also control who mates with who. There's also the need for genetical variety, where most males and females share the work of reproduction. However, if just a small number of individuals in a flock don't reproduce it won't hurt the flock, it is barely possible to recognize the difference, as normally flocks of monkeys are quite large. However it seems likely that species with very small flocks don't have that many homosexual individuals. Judging from our closest monkey relatives, a human flock was around 200-800 individuals large before civilization begun.