Masculinity is what feminity is not.

The unmanliness of staying at home is that women will never select you on the basis of your ability to do common household tasks for the sake of financial efficiency. You're married with kids, so you're safe for a few years. There would be no way a woman would enter a situation in which you are not bringing home dollars. The sexual equation does not permit women to let their vaginas remain unleveraged for favor and fortune from men.