From the Code of Conduct:
"To make things a little easier, here are some rules of thumb which should give you a pretty good idea of what is generally deemed acceptable: For example, kissing and holding hands, regardless of sexual orientation, is perfectly fine. On the other hand, Groping, tongue battles, nudity and beyond, regardless of sexual orientation, is not. Remember that your personal preferences or fetishes may offend those who do not share it, and who may not want to be associated with it. If you expect respect from others - especially from people outside of the fandom - show them respect in turn. While collars and leashes may be worn discreetly, blatant displays of bondage and BDSM in public are not allowed. Public exposure of genitalia, buttocks or (female) breasts is definitely not permitted. As a rule, a minimum equivalent of a non-thong bathing suit must be worn at all times in public areas. "Anatomically correct" costumes must be likewise clothed. It is also explicitly not allowed to visibly wear diapers or baby outfit in public, even if its part of a costume. "
Just remember, people might not be comfortable in having someone running around shirtless covered in body paint in the lobby.