I have a friend who mentioned his 'kick in the balls' theory..it goes something like ..every chick flick will have a 'kick in the balls'(literally) slap stick scene because it is cathartic to women and that Hollywood knows that and will cater to that unconscious trigger for laughs. I started looking for it in movies after that and I have to admit that it's true that there would be at least one hurt male genitalia routine. Remarkable.