I personally don't think genetics have anything to do with being gay. I wouldn't say that my genetics made me pansexual as much as I would say my Father's genetics made him straight. If Homosexuality was a gene, I don't think I would exist at all. It would be a gene which, in the eyes of natural selection, is completely useless. A man and a woman can have a child but a man and a man can't unless it is adopted. For natural selection, the idea of keeping a gene like homosexuality simply would have been worthless. My belief is that nature gave us the instinct to keep our bloodline going. What nature didn't account for was something that it had never seen before, Choice.

Humans are, as far as we have researched, the first animal on Earth that has seemingly given itself a Choice on who we want to be with. Every other animal on Earth acts on instinct but Humans have something they don't have. If we face a path leading down a dark road and one leading down a bright road, we have the choice to go down whichever road we want. A normal creature would go down the bright path, it does seem like the safest path by instinct. I chose to be a pansexual, which wasn't as easy as many people think. I could have easily determined I'm gay or straight but I chose to be a pansexual. But choosing your preference isn't something to be easily done. Some say it requires experimentation to truly figure out, others say you were raised to be that way. Me, I say that you have to figure out for yourself. For me, I spent hours wondering if I was truly straight.

By all standards of psychology I would be considered straight so I was. But, I knew that I didn't solely love women. Hell, I had know for a long time that I had feelings for a rather handsome boy in one of my classes when I began high school. Like a fool, I hid this and convinced myself that I am straight but, when I chose to be a pansexual this year, I accepted that I liked males as much as I liked females. But I felt that, if I can like females as much as males then would it really be as big of a gap to jump to the conclusion that I would be fine with dating a transsexual? I found that the answer was no. Did genetics force me to chose pansexual rather than anything else? Did society pressure me into it? No is my answer. I had chosen to be pansexual because I knew that I couldn't care less about what one's gender is so long as I knew I loved the person. Genetics had nothing to do with my decision and society, while it may effect others, had no effect on me. Society didn't tell me I had to be pansexual, I did.

The idea that genetics made someone gay or their parents raised them to be gay is a scapegoat from a time when being gay wasn't acceptable and, like mdk says, it is a very weak argument when you are an adult.  We live in a time that is growing far more out of its comfort zone. A hundred or so years ago, our society didn't accept or even recognize homosexuality as something that could be normal. In fact, if I remember correctly here, homosexuality use to be believed a mental disease which you would be sent to a hospital to correct. The last generation and our current generation(the one I am a part of) has been forcing change upon our norms. In future generations, I'd venture to say that homosexuality is far more normal and acceptable than it is now. Will it be more easily found than heterosexuality? Probably not but another generation may face a change where heterosexuality and homosexuality have been replaced for bisexuality where a man or woman can love both genders and it would be completely normal. But, that is only if society learns to accept every sexuality without limitations. At least marriage equality is now a thing in the US which means we are probably on the right path.