We have been together for 2.5 years, and have had some kinky stuff in our sex life, but just the other day my gf admitted that she has had thoughts of adding a girl before, for a threesome and also for me to watch her with a girl. I listened to her and was very understanding and told her that it would be something I am interested in trying in the future. Since she took a lot of courage to tell me her fantasy, I found the courage to tell her I have thought about something very similar, her with a guy. She was a bit shocked, but once I told her that it was all for her, and that the jealousy of another man with her is a turn on, and that her enjoying herself is what turns me on, she understood. Just needed to express how an amazing night it was talking to her and truly being open :)