So easy a caveman can do it

I want to know how come a man running for office never gets asked how his job will affect his role as a father or vice versa. However, once a woman starts running for office, people question whether she can do both. The last time I checked woman have been incorporating both roles successfully for sometime now. Or is it that a man can immerse himself into his job more because he knows the mother of his children is there to pick up all the pieces including the “little job” of raising the children. Why does the fact that you know how to reproduce have such a bearing on whether or not you can do your job?