You met Bob and Barbara at a bar yesterday and let them crash at your house, they look the same but they're completely different individuals, Bob being a male version of Barbara and Barbara being a female version of Bob. Now they're fighting over who gets to date you..

Bob: "I THINK I SHOULD! I'M A GOOD COOK, CLEANER, AND PROVIDER!" Barbara: "I CAN DO THOSE TOO! WE'RE FROM DIFFERENT UNIVERSES, THAT'S THE ONLY DIFFERENCE BETWEEN US!!"