If you are dating one segment of a human centipede, are you actually in a polycule?

[Your Starter for 10]

If you're not dating the head segment, you may have to talk to them to communicate with your SO.

 

[We Are The Witches]

No, but you'd probably be either an accomplice, or a negligent person for not reporting what's happening (the crime for doing that to those people) to the authorities.