[Drew]

I'm scouring Google right now for an article I read in a scientific journal while I was researching something unrelated for biology. I'll edit it in if I can find it. Anyway:

The article basically reviewed and debated a theory that humans can actually alter their genetic make-up on a very small level. It reviewed a study from John Hopkins that followed a man for something like 8-10 years, with tissue samples being taken regularly. The man grew up in the South and had moved Maryland only a few months earlier. At the end of the study, several aspects of his genetic make-up had had noticeable changes, such as the genetic structure that helps define your personal preference for temperature and another that helps define the tenacity of your immune system.

Anyway, this study would indicate that it is the environment and/or mental state which defines homosexuality, since being born homosexual would be a mutation of nature. Unless someone was born to a person with those altered genes.

This whole thing is still in the theory phase. If I can find it I'll post it. Checking the JHU archives right now.