'A man may begin feeling a fleeting moment of regret at never raised a family when he's invited to a college buddy's daughter or son's college graduation, or wedding. It's often not till such a happenstance that it occurs to a middle aged man the children he might have had would already be grown. But that's a 'guy' thought that doesn't have the same 'finality' that a woman realizing she's infertile forever can have. As a man, I think childless men think of not having been a father the way they might occasionally regret a profession they wanted to be, but didn't pursue till it was too late. It doesn't seem to have the same impact that a woman feels realizing she'll never be a mother. '