I think it's just entertainment factor.
People pay money to see these movies because partially nude Jolie is almost taboo. How many movies has she appeared in full frontal nudity (Besides Original Sin)? She is considered to be one of the hottest celebrity right now.
You can make the same argument with female audience and male celebrity. How many women watched Fight Club just to see Brad Pitt shirtless? And Fight Club has NOTHING that appeals to ANY women (even lesbians). So what, the women all over are weak and AFCs (for the lack of a better term) just because they paid money to see Pitt shirtless for 30 seconds?
What about the guys who go to strip clubs and buy porn? Why in the world would you pay high entry fees and ludicrous drink prices to spend an hour at a strip joint to see naked girls dance? Surely, you can invest that money and time somewhere else more productive (and don't call me Shirley).
And buying porn. Why not use that money to take a girl out on a date who you might end up laying? Why waste time looking at porn and masturbating while you could be spending that time to date girls who might blow you?
Do you see? It's purely entertainment. Yeah, I can spend the $10 somewhere else like buying gas, but damn it, I just want to see some ass and side-boob shots.
![Wink ;) ;)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)