Hard wired to want children and hard wired to want sex are two very different things.

When given the choice there are plenty of people putting the latter over the former, and the number of women stuck at home while their husband went out to have affairs suggests the reality of kids doesn't actually interest most people. Plenty of folks just want a status symbol, not the responsibility of raising a child.

I think just about everyone wants more sex than children. That said, many people would love the responsibility of raising a child but don't feel like they can afford it.