if they existed and humans were not evolved from apes then:
they will only have kids of their own
forcing their kids to do it with each other
the result? damaged babies and the end of the human race at some point not too far from there.
whats weirder is how those 2 only had 2 kids, both were boys and 1 killed the other.
now tell me how the hell is it possible ?
whoever wrote the bible clearly just showed examples of don't lie don't kill so on, he made it obvious so people won;t think there is a god.
for your question:
it happens if the right area is created.
human brains are very flex, if you only see guys (such as in boy-only, girl-only schools which actually existed and maybe there are still some i don't know) it's natural for some to start thinking the other way when they simply don't see the right answer cause it's not there.
where were the gays and lesbians in history? why did they come out only about 50-100 years ago?
simple because at the time and all of the history before it the family was the group, family told you everything you know and that's it.
then they told you to marry this and that girl, no way to mistake cause in every house there were both guys and girls and no one wants their own family... -.-
so then there were boys-only girls-only schools, why not together? cause girls were considered "less the boys" like a bunch of pets that only multiply and take care of the kids
well.. that is their natural cause but how come the boys were told they can become more than hunters? weird..
but now, thanks to that there is an option so people don't see it strange if they are confused about their sexual identity.
they even fall for the confusion, after all there is a period of time in which boys hate girls, girls hate boys, and sadly certain parts of the mobs are more confused than others.
but remember- it's not the gay people's fault.
it's the entire society who told girls they can't and forced it to happen.
shame on you stupid god believers for following the bible guidlines which clearly say that boys are better than girls.
so don't hate them- hate god, hate the god believers and hate yourselves for hating those who couldn't avoid it.
don't hate people just cause they were born to a society that forced something on them.
(that's why hating a muslim/christian/jew only cause they are and not cause they are dumb enough to believe in god(or otherwise if you believe in god then just hate cause it's another religion) is a dumb thing to do .
but again, they didn't hate person X cause he is diffrent, they did it cause society told them something which is wrong.
don't hate blacks, don't hate muslim, hate morons and hate the soceity that made you feel like it's easier to hate those people)