I'm not talking about Darwin's theory but the fact that a Mormon girl looks for the following things in a Mormon guy: has the priesthood, went on a mission, has a calling and wants to have a huge family. So she marries him in the temple and a couple of years after their first child the Mormon girl now a Mormon wife finds out her husband is gay and can't quite shake it, Maybe added to her selection list should have been: heterosexual, honesty, will love ME and not love that I'm Mormon and add what else you think should be on this list.
I tend to see homosexuality as what you're thinking so having a child with a woman makes no difference about how you really feel, not to mention when the guy ends up leaving the woman for a guy and stays with the guy.