Some people just aren't meant to be married or have kids. They're are some people that simply aren't programmed to have kids, or have a family... I have friends like that... One is simply so narcissitic (exactly like Go4It in all aspects) that he couldn't possibly handle having something that would force him to take the attention away from himself.
Others merely would rather hang out with guy friends and have no interest in having a partner.. they go home, play Xbox, go visiting exotic locations... and never really desire a mate.
It works for them. Doesn't work for me.