Suzanne Venker of The Federalist discusses differences in parenting choices and priorities between men and women:

Once a baby arrives, a woman’s nurturing gene almost always kicks in. Providing for her child emotionally is her first instinct, which is why going back to work so soon is heart-wrenching for mothers.

A father’s reaction is different: his first instinct is to support the family financially. It is not his sole contribution, but it’s first on his list. Simply put, that men and women may both be capable of performing identical tasks doesn’t mean they want to do them with equal fervor. Desire matters.