Beautiful women are more pain sensitive than ugly ones?

That's not scientifically possible.

I'm really not sure if you're joking or not... It doesn't matter what the person looks like or whether they're "pretty" lots of people have different ideas of who's beautiful and who isn't, you wouldn't be able to bare pain anymore than the next person. The only way you could bare pain more is if you're used to pain and you experience it a lot, say you always get you're eyebrows waxed, you'd become used to it whereas the next person won't.