Explicit?
The thing about this kind of sex comedy, is that it is all about the desire for sex and not actually having sex at least during the time frame of the play.
Before and after, yes. Not during.
16? Absolutely.
I saw Forum at 13 (and got most of the jokes). Same deal - innuendo and out the other, but not during.
"If my life weren't funny, it would just be true. And that would be unacceptable."
--Carrie Fisher