Actually, I have been doing quite a lot of research, and and would fall under body modifications! Crazy what you can do with google!
Technically in my state to become a --certified body modification/piercer-- Id need my bloodborne pathogens certificate (already acquired)
Auto clave
And sterile body Read more… modification studio
Optional certifications/training would be, safe suturing, wound care, first aid, and cpr.
So it would not be assault 😘
You're acting as if I would do this in a back alley with a rusty pocket knife....this yes would be kink based but done to the standards of any body modification artist. Hell you can walk into any --GOOD-- modder space and get a urethral reroute for about $500.

I am not talking about fantasy, I am talking actually removal of the testicles. I have had a few irl subs that were 100% into it, and one actually went through with it with another Domme, and the thought of doing it excites me, thus why I want to research and learn.