That is a good theory, Chrissi! I've also wondered why men do that, it's so distracting! (Come to think of it, maybe that's why they do that!)
This is not an interruption, the whole purpose of the Vagina Monologues, IMO, is to get people talking about these things. And some of the monologues start out rather random, such as the treatise on moans or the discussion of, ahem, aromas, and it's amazing what they evolve into!
Since we're on the subject of sexual organs, here's a little Friday funny:
One saggy boob said to the other saggy boob:
"If we don't get some support soon, people will think we're nuts."