Wow! I'll share this...While traveling overseas, I have witnessed couples engaged in sex, (parties, maybe even an orgy or two), but I have never took part in the activity around me. Maybe prudish on my part, or maybe just shy, I dont remember. I do know I was sexually aroused and I did find a partner I completely devoured later that evening, but I did not engage with what I had witnessed. I have also had threesomes, both MMF, and FFM, always somewhat tipsy, and never was it planned, it just happened. It was never with someone I was involved with either, always while I was single. With the FFM, I did enjoy more and I did watch more before interacting with these ladies. But what a night! To your question, I dont believe I would partake in having someone just watch me and my woman engaged in sexual situation, Im not sure though, the situation would have to present itself. Something to ponder I guess. I know, I didnt completely answer your question.