Men do not nag, lol
I think women do it more often because immature men think the wife is like a second mother, when in fact we are not. So we bitch, to correct the behavior.
I don't think they do. My husband is married to me and he has single friends. He was in Germany without me and when his friends would go out on the weekends....he stayed in and played X box. why???!!! Because he had a damn ring on his finger and knew better.