Don’t fuss. An 18 year old is not an 8 year old. Neither is he a 28 year old. In any case, don’t underestimate the people you play with. In any case be comfortable with the subjects you deal with, and don’t be surprised when the teen or child you’re playing with is more comfortable with a subject then you are.
Most importantly, don’t obsess about the matter. In any society where people tend to go skyclad because of the climate it soon becomes part of the background and really nothing to commit on. If the mode of dress is a tunic and kilt, then that is just background and nothing to get all upset about. We adapt, and the young adapt very quickly and completely
As for the audience, remember that they can also adapt to what you are doing, as long as you don’t fret and fuss about it. Don’t try to hide what you’re doing and be comfortable with it. The worst thing you can do is to be defensive and evasive. Above all, don’t cower. Even more importantly, listen to the other person and remember that he is a human being worthy of your respect and consideration.
That’s my take on the subject.