Well, we had out threesomes ourselves. Both were FMF (being the male, I'd say I was the star
), but both were polyamorous relationships, one that lasted more than a year, and another one which... I guess, it's still going on (our friend lives in another country and we're all looking foward to meet again).
Now, seriously, I don't know if someone have allways the "star" role. My wife isn't bi, I mean, she wouldn't be in bed alone with our girlfriend, os it's mostly about the three of us togheter, or some of the women with me. With the three of us in bed, it naturally happened that we switched places, I mean, someone of us was the lucky one getting the attention from the other two, and the next night someone else was the lucky one.
So, I don't believe that sentence fits our case. Moreover, it sounds like a smart sentence on a topic played by ear.
And when I think of a MFM scenario, and playing by ear myself since we didn't have the actual experience, I don't feel like enjoying the "star" role as one of the males in such an scenario. Perhaps it is a "male thing", but I believe the only way for one of the males being the star, all or most of the time, would be "dimishing" the other male's role, and the scenario making something like this feasible and enjoyable for everyone involved would be a cuckoldry one.
Because if this I believe the sentence doesn't fit every case, because it supposes tehe should exist some hierchy between the involved people, and the only way to enjoy the game would be being on the top of it.