> Are there honosexuals in other species too? If so, under what conditions.
> Are there homosexuals amongst the monkeys and apes---our nearest
> relatives.
Yes and yes. Homosexuality and the pursuit of sex as pleasure instead of procreation are both extraordinarily common amongst animals. More at: http://en.wikipedia.org/wiki/Animal_sexuality
> Were there homosexulas amongst in the primitive commune set-up as well.
Yes. Lesbian and gay people have existed in every society we know of.
> Is it a natural bestowing or is it a problem?
> Is it a fashion, and does it have anything to do with the fashion, and the
> psyche of being fashionable?
It's entirely natural and has nothing to do with choice: http://psychology.ucdavis.edu/rainbow/html/facts_changing.html
> Child abusers, are they connected with the phenomenon?
No, they're not. Child molesters are overwhelmingly heterosexual: http://psychology.ucdavis.edu/rainbow/html/facts_molestation.html
> The natural function of sex is procreation.
Other species routinely mate for pleasure, masturbate, or otherwise engage in non-procreative sexuality (see first link above).
-- DRR