Originally posted by Mr Mxyztplk
I think that homosexuality has been built into life as a form of population control. At any given point in time we have to have a balance between supply and demand. Back in the day when we were hunter gatherers we could only support so many people and having a kid was not always a good thing, because that would mean yet an other mouth to feed.
With hetero sex there is a chance of procreation, with homo sex there is no chance of having a baby, so nature builds in an automatic defense against over population by making the chance that some members of a group gay so there will only be so many people.
That’s just my 0.02
From what I have studied, you are absolutely correct. The first known observed instances of homosexuality in animals was in seagulls and other large colony animals. It seems (at least in birds) if a colnoies population density reaches a specific point X number of females mate together, going so far as to produce sterile eggs and the number of mating pairs of females remains high until the population density begins to drop and then the mating female pairs begin to drop in proportation. Also it appears in colony animals such as seals where alpha males dominate all the females.
I see know reason to doubt homosexuality in humans does not have the same biological triggers.
That being said bisexuality has something to do with the nature of higher order brains... humans, the Bonobo (our closest living relative) and Dolphins all have sex outside of heat and all practice bisexuality.