If he did, he likely did that before it was possible to create photorealistic digital clones. Then it's an interesting question about how US contract law works: are you able to agree on something that is not possible at the time of signing?
Surely, if the contract would contain some explicit clause about that. But if it just said some like "we can do anything we want with the video material", then it's probably less clear.
You could also try to get a tungsten replica of your genital. It's probably more expensive though.