I have had many dozens of relationships with couples where the hub would suck me at one point or another. What is much more rare is a, mfm where the three people are equally attracted to one another. I had one very long relationship with a couple that worked this way. He was one of the rare men who totally attracted me, luckily the sexual attraction was balanced all the way around. The wife got a great deal of our attention, but she loved to help gang up on one or another of the guys too.