I must admit that I have had FMF, FFM, MFM, and MMM threesomes. Although I certainly enjoyed the FMF/FFM, I found that one guy and two gals is somewhat limited from the guy's perspective based on the male refractory period. I found MFM with my wife to be the most exciting and pleasurable. Surprisingly, MMM is an awful lot of fun. Guys are far more goal oriented and have far fewer hangups once the pants are off.