All I can think of is everybody dated everybody.

Ben: Hello, this is my girlfriend Mal, and her girlfriend Uma, and her boyfriend Harry and his boyfriend Gil. And then here is my other girlfriend Evie, and her boyfriend Doug. Also Mal and Evie are dating, plus so are Jay and Carlos who are also dating Harry, and Jay’s also dating Lonnie and Carlos is also dating Jane. Also Doug and Evie have an adopted child named Dizzy. :D