I don't see how a butt plug would cause any internal injury. A plug is not long enough to penetrate deep into the body cavity. Though I've never danced with one in me, I have used them a lot. My suggestion to the person who is interested in dancing with one is to try it out at home, and let us know how they get on.If we never hear from them again, we can assume that they have died from internal bleeding, and we'll all know not to try it ourselves.If they love it, and tell us about it, we'll all have a new activity to try out! :)[/i]