If someone was born and then raised on an island with no human influence would they still have sexual urges? Upon meeting another person of the same sex and someone from the opposite sex for the very first time, what (who) would they do with the sexual urge?
A gay gene? They haven’t identified millions of genes yet. That they haven’t identified it yet doesn’t prove anything. Have they identified a gene that makes humans have an attraction to the opposite sex? Sigh is right.
Here's another for you:
Prominent research teams Byne and Parsons, and also Friedman and Downey, each concluded that there was no evidence to support a biologic theory, but rather that homosexuality could be best explained by an alternative model where "temperamental and personality traits interact with the familial and social milieu as the individual's sexuality emerges" (Byne and Parsons, 1993; Friedman and Downey, 1993).
"Homosexuality Is Not Hardwired," Concludes Dr. Francis S. Collins, Head Of The Human Genome Project
By all means keep typing — It's a huge detriment to your credibility.