Meh... I'm pretty sure that if that girl was ever going to fall in the ocean... those boobs would just float...
I'm alright with my girlfriend, and I don't think there's any way I could have better sex than what I have right now. So give me the 500$ right now.
And the most important part of the deal...
it's important when you have sex with someone that you find him or her attractive. But it's not counting for more than 20% of the deal... the most important part really is the relation you have with your partner and the sex "quality" itself (if I can express myself that way).