Evolution and Homosexuality

I have a hard time accepting homosexuality from a biological standpoint. If the statistics are correct, thousands of homosexuals commit suicide annually in North America. That said, according to the theory of evolution, or more specifically natural selection, traits become more or less common in a population due to consistent effects upon the survival or reproduction of their bearers. So, if homosexuals are constantly decreasing due to suicide, why are their genes still persistent? Why haven't they gone extinct? Moreover, if homosexuals are unable to conceive, how are their "gay" genes passed on?

This is why I think homosexuality is purely psychological. It's a choice a person makes due to environmental pressures. It will never be hardwired to me, ever.

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