Why, he's an adult? If it took one hour to "convince" him of something he was looking to be convinced.

Here's the question, let's pretend the doctor convinced him he had a real disease - like penis cancer - and the only way to not die was to have his junk amputated.

Later it turns out, his doctor gets awards for the highest number of diagnosise, so he "diagnosed" him with no objective proof and left him with severed genitals in pursuit of winning this award.

Do you think he should be able to sue the doctor for malpractice?