Reminds me of an act that we used to see at the AZ Renaissance Faire, the Tortuga Twins. Their shows bordered on naughty, but the final show of hte day was definitely adult oriented. They announced it multiple times before the show, they unrolled huge banners saying 'R Rated Show!!!!', in short they made a Huge Stinking Deal out of the fact that the show would not be appropriate for kids. And every year we would see several parents with young kids, 8 or 9 and younger, at the final show of hte day. Never saw anyone getting cranky about it, and I'm pretty sure the Twins didn't modify their act any, but it always made me wonder.