My wife and I have had lots of FMF fun (which is incredibly hot), but she is not into MMF. I have had a couple of one-time encounters with other couples, but both were extremely uncomfortable for various reasons. Once the woman wanted it but was so shy that she wore a blindfold the whole time, so she couldn't see me. The guy and I never touched, just took turns with different parts of her (she lying on her back on the bed, barely moving). The other time, it was all about me and the woman; her husband didn't even get undressed buy lay beside her, stroking and whispering to her while she and I fucked. Kind of touching, but also weird.
I would love to try again with a couple that was more interested in mutual pleasure all the way around, including between the men.
I would love to try again with a couple that was more interested in mutual pleasure all the way around, including between the men.