There is a documentary called NUTS on netflix or prime.....
Yeah but he was proven to be a straight up fraud.
Damn are gonads transplantable?
Technically they could probably do it but there are serious ethical problems, not just BS ones, that probably won't be resolved before they can make some sort of artificial gonads. Basically, the transplanted gonads still make the sperm of the person they were transplanted from so technically HE would be the father not the recipient of the transplant. Here is a quote from Johns Hopkins who has performed the most extensive penis transplant to date on a soldier who lost ALL of his junk in an IED blast.
“You’ve made that dead person a sperm donor without their knowing about it, so they could not have consented to it,” he says. “You’d cross a line: it’s not just restoring function — sexual and urinary function — you’ve granted a person the ability to reproduce, but with someone else’s gonads.”
And aside from some monks and batshit crazy people, neither of which will meet the criteria of "sanity" who voluntarily chop off their balls, you gotta rely on dead organ donors. I guess we can add a question "are you ok with someone else making children with your sperm after you die" but that would probably make a lot of otherwise would be donors nope the fuck out of the entire thing. It would be the same as asking women if her eggs could be harvested after she died so some infertile woman that she will never know, or even know how many before she dies, can have kids that are biologically hers.