For a long time when we were living in SE Asia i was traveling a lot and my wife had a girlfriend who would come and stay with her while i was away. usually i got home on a Friday evening so we all went to dinner together and back home to enjoy a lot of sex together. The she would go home and resume her life as a uni lecturer. It was all very relaxed and satisfying.
Yes, of course, that wasn't the meaning I wanted to give, but indeed for more pleasure. A woman with two men is likely to have more pleasure than with one man. A woman with a couple, the pleasures will be different.
Yes, it gives possibilities, but it is also necessary, or it becomes obvious: a woman with two men, the woman becomes the queen. A man with two women, the man becomes the king if he can manage to fuck both women well.