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This one is much better https://www.reddit.com/user/tensorfakes/posts/ (NSFW porn of course)

It's funny you pick this as an example; the very first thing I see is the cut line on her eyebrows, like some hideous plastic surgery gone wrong. Skin tone doesn't really match either. Perhaps this stuff is less visible if you're distracted by the rest of the scene.

Yeah, but merging the new face with the old picture is not the purpose of this tool. Rather, consider how the new face has a realistic expression, and how indeed the skin tone doesn't match perfectly.

The girl/guy sex vid... has her face been superimposed? If so is that a celebrities face?

Yes, yes, Scarlett Johansson.

There goes my afternoon.