I'd recommend a yoga DVD and maybe a heavy metal plug or two. Yoga bodies are...tasty. Watching someone do some naked yoga could be a great way to spend a half hour. Having someone watch you do yoga while trying to hold a metal or stone plug in place could also be an enjoyable way for someone to spend a half hour. Could be empowering. Could be embarassing. Could be humiliating. Could be very challenging if dropping the plug carried consequences.