When I met my wife she was real shy, but over the years she has confessed to being a closet slut. I encourage her to be as slutty as possible. We usually invite a guy over that she finds attractive and have a few drinks. After a couple of drinks, she is very relaxed and then I make an excuse to go to the store. When I get back, she is in the bedroom naked with this guy. She recently told me that she would like to try three guys at once, so we are working on that.