Never been to Exxotica but have been to AVN and also Venus for comparison. AVN is very tame compared to Venus, also much more expensive. They do a VIP pass that allows you to attend private parties where you get to see a lesbian show. The first one I attended had Natasha Nice doing hard lesbo with another model can't remember the name of. These parties are the only time you will see bare nipples during the entire time at the AVN. Compare and contrast with Venus were many models will have their tits out on display and some allow you to pose and grope. They also have some enclosed sex shows where you see porn guys being sucked off by models.
In a nutshell, AVN is very expensive and very tame compared to the shows you get in Europe. Also if you want to fuck any of your fav models in attendence, you have to have a recent clean STD test and lots of $$$$ as they have to use the facade of a porn shoot to legitimately allow you to pay to fuck the models, but hey that's just the laws in Murica, land of the free to be prosecuted.
On the plus side I did get to meet Hitomi and a few other legends of the big boob porn world.