Not that I'm being insensitive to your pain, but ask any woman who has given child birth what that feels like! harden up
Women quite often optionally give birth more than once,ive never heard a man say "I could sure go for another kick in the nuts"
Therefore by logic alone,getting kicked in the nuts is worse than child birth
Granted no man wants to be kicked in the groin area.
Even though child birth is optional, obvioulsy by doing it we're keeping the human race going. My last point is that most women forget the pain of child birth not long after but going through it is hell. which is probably why some men choose to not to be in the delivery room. Could you honestly say you'd want to give that a go???