We're talking about the craft of acting here, there's a lot of hard work involved in creating a character and working to sustain a role and all the other stuff is fringe. The fact is, unless you have some sense of who you are and what's right and what's wrong when you leave your hometown, you're aiming for trouble when you come out here. If you really get seriously involved, the work takes a lot of time. A newcomer does need a value system. I'm not saying you have to agree with all the rules of your society.
Ethics is a personal code of behavior.
A personal definition of right and wrong - that you stick to no matter what. Don't violate your personal code of right and wrong, and you can't get hurt. If it's alright with you, if it's part of your value system that it's okay to do nudity, then you're not violating your ethics. If it's not, it's not, no matter what I say, no matter what promises I make, you don't do it. I'm just saying it's your personal code.