It disgusts me tbh, because they ain't only lying to themselves but their family too. Some older guys have asked me for sex when they're married and stuff and I'm like no dear, I don't play like that; call me moralist but I wouldn't feel good doing it.
It depends, sometimes they are happy and not looking for sex or anything. If they have children that they love why should they ruin their life for the gay life that often won't bring them any stable relationship?
Sex is a very very small part of relationships as you grow older