Give me a link to a medical, genetic or other scientific research paper that identifies a 'gay' gene.  It's also possible for heterosexual males to have 'female' genetic markers.  In fact all of us do.  We got 'em from our mothers.  So until you can show me some quantitative data confirming the presence of a 'gay' gene and its actual LOCATION in the human genome, you're in the same boat as the Christians concerning their various squabbles about what Jesus (alayhis-Salaam) said and did, and what he meant by it all.  In short, you BELIEVE in the existence of a gay gene, and that's all you got.  Prove me wrong.