I completely believe that homosexuality is something in the genes, whether it is an addition or a lack of genes is still a question in my mind.
The repulsiveness of male homosexuals, to me, is simply too strong to be due to upbringing/environment. It's like smelling a skunk. My brain is wired to interpret that smell as bad.
Hmm...then what gene causes so called bisexuality? Half a gene?
The must be a pedophilia gene too, right?
I base my beliefs on objective truth, natural law and facts.