My wife and I have same room sex on 3 different occasions over the years. Each time it was quite by accident, meaning it was an unplanned occurance everytime. We found it to be very arousing for both us each time. By same same room sex I mean someone or another couple was in the room while we were having sex. We'd like to do this again, but find it near impossible to set-up. We can't very well ask our friends if they'd mind watching us have sex. Any suggestions as to how we can orchestrate this again?