It's obvious why: they are terrified of losing access to the kid.

Their every possibility of happiness lies in the hands of one person: a person who gets hormonally disturbed every 28 days.

If they do anything to piss off the mother, or if the mother just wants to travel without him but with the kids for no reason at all, it's going to happen and the cops will make sure it happens.

The mother won't have any budgetary problems with satisfying her whims because the father will have the wonderful choice of pay her new boyfriend's rent or enjoy jail.

If it didn't cause problems with making new kids, I swear they'd castrate them.

It turns the father into a completely pathetic creature that cannot possibly earn respect. They're like laborers in Auschwitz, busily working not for greed or the pleasure of it, but out of terror at what will happen if they don't.

I won't be that figure to a child. And women don't want to lose the excessive power they've been given, however destructive it is to the child.