Except that was a gay man that slept with a girl
So, are you saying being gay is the same as having a one-night stand?
Absolutely, gay men don't have sex with women, it's just a one-time thing.
Being gay doesn't mean men are obligated only to sleep with other men. If they choose to have intimate relations with women as well then its their own business. It's better to mind your own business instead of commenting and offending someone you may not know anything about.