It was possible to do face swap images in photoshop for a long time and people learned not to trust random nude celebrity images, I believe it's the same thing

It was possible to do face swap images in photoshop for a long time and people learned not to trust random nude celebrity images, I believe it's the same thing now with video. There are some fun grey areas where you have someone doing porn who actually looks like a celebrity. The good news is that you should be able to easily detect a face swap video, by comparing the face against public images that were taken of the celebrity and comparing the rest of the video with porn videos (like Youtube's ContentID).