rusty_knight: It seems to have quite an 'impact'!
I guess a 'double impact' must equal twins - right?
And if you have quintuplets or sextuplets it's definitely time to 'slacken off' and take a break!
Personally, I don't think enough consideration is given to the feelings of the father during childbirth - if only the doctors could tell the father to be how long the birth is going to take the man could quietly sip another beer (or two or three) and maybe even have a game of darts to make him feel less nervous and more relaxed.
This would also make the mother feel better as her man/husband/sperm donor would eventually turn up without a care in the world making cute little belching noises (a bit like the baby, but louder).
Oh, we should think about the 3rd option: getting help from the sperm donor! No side effects, no empact on vagina! , and ... but sorry to say no natural and real pleasure millions are looking for!