That's irresponsible! Fournier's gangrene or another form of sepsis is likely. She's committing a crime. Even if the patient wants it, it's considered grievous bodily harm under the law. I would never comply with such a request.
So what? Nobody needs to know. That's between two people.
The dick and balls are toys of a woman. I think it's a beautiful action to let her do what she wants.