The thing to take into mind though, is, what about people who aren't really into theatre and are seeing their first Broadway show. It just seems to me that everyone should get the performance they paid their 100 dollars for.
HOWEVER, like Joshua says, as long as they don't stray from the script or just act their looking stupid.
I understand that it's only human to break out once in a while, but if it's all the time (I've heard of a couple of actors that are like, every other show there's an error) then it's unporfessional. In my opinion at least.
"It's a great feeling of power to be naked in front of people. We're happy to watch actual incredible graphic violence and gore, but as soon as somebody's naked it seems like the public goes a bit bananas about the whole thing."