I have done this too, because I was with someone I just met and I had no idea that this was the kind of party I had been invited to until something started to change. I asked my date if she wanted to stay and she said it was up to me and I thought honoring her and assuming that meant that she wanted to go was a mistake. She said later that she wanted to stay to see what it was like for her boys, who were 5 and 7 at the time, when they encountered this for the first time. We also broke up shortly thereafter, which of course is par for the course. As a writer, too, I was interested, but I was so turned on by the event that I didn't dare share that with her. There was a cute little MFA in Philosophy sitting in front of us but turned toward the right and sitting on her knees and leaning back. And there was an Asian woman, on the bed with a bunch of other people, who I thought was gorgeous. I regreted that experience. I should have stayed. You never get to experience that event in the same way again. It's just gone and regret remains. I feel I would have been a better writer. but I also may have gotten an STD.