Thank you for replying and explaining!
And ah, I didn't realize the connection, partly because I could make it without this detail. But IMO, it feels too weak to be noticed and used for identification: (1) their distance isn't particularly close; (2) just staying together among the crowd while they were still conscious doesn't necessarily prove a relationship - they might happen to be dancing, chatting, or even fighting (unless it's a rendezvous in a small room); (3) if they are still interested in each other, they could have started dating long before the event. That said, if the vote says "marry a supermodel", and rings are found on their fingers, that seems to solve all these issues.
Anyways, I'm looking forward to the final version of the game :)