My mom describes childbirth as fitting a nice big watermelon through a keyhole...she has six kids, I think she'd know

The worst time to hit a girl in the breasts is when she's PMSing because they're a lot more sensitive and from experience, even just slightly brushing up against a wall hurts like h3!!. Yeah it might hurt the guy to be kicked in the balls, but when a woman has a baby, injuries can last a lot longer than just delivering the baby. If she rips something, that hurts for a long time, or there's the chance that she could lose too much blood.