I sort of relate to this dating a couple thing... Now I'm not 'exactly' dating a couple but here is my situation:
I am a married woman with two teens from a previous marriage. My current husband is bisexual. We decided to open our marriage sometime last year. He then met a friend's male partner and they became friends with benefits.
Said fwb has two mates, one bi-male and one female (triad) and they have small kids. I became involved with my hubby's friend (in threesomes at first, then on my own also) and we eventually fell in love; he is now my boyfriend I guess, lol. We also occasionally 'play' together with my bf's wife as we both have some bi leanings. Soooo as you can see, it gets complicated.