Topless dancing....??

My friends wants to try topless dancing for one time. Im kinda worried about her. She said that when she is dancing, customers wont be able to touch her or take pictures,videotape, etc. Is that true? What others rules are there that i should know about? It might vary by state, but whats the general/common rules or the rules of your area?i know its not a good thing, but i cant stop her. I just wanna know the ground laws