DH is 56 and I am 44 and been together since 1999. We have sex usually twice each week and talk openly about things with each other. DH has for a couple of years wanted to watch another man making love to me and he has shown me films on porn sites on the subject. His fantasy is simply to be in the same room while I have sex with someone else and him to watch but NOT participate. I am considering agreeing to do this over Christmas and wondered if any others have had either negative or positive experiences? Advice welcome.