Cam-to-cam
Definition
Cam-to-cam is two-way video. The performer already has a camera. You turn yours on so they can see you as well. Some rooms require it for certain tip amounts or for a private.
Why it is a different risk
Until you hit that button you are a username. After it, you are a face, a room, and maybe a window. Treat it like any other time you put yourself on a live camera. Cover the lens when you are done. More: device privacy and the safety checklist.