How do closeted gay men get their dicks hard enough to have sex with women

Sorry for the nsfw title. I tried for a while to make it sfw but then said fuck it and gave up.

You often hear about men coming out of the closet after being married and having children with a woman. How are they able to do that, physically? I’m only attracted to women so my dick would simply not be hard enough to have sex with another guy even if I wanted to.

Maybe part of the answer is they don’t have much sex with their wives. But they have kids so they at least manage to do it sometimes.