A lot of things can kill you. A tiny clump of blood in the wrong place at the wrong time, a short-circuit in one of your tools, you get misdiagnosed and mistreated by your doctor (statistics say 10% of doctors will accidently fuck you up.)

And this kid died from jacking it: https://theboxhouston.com/8586872/brazilian-teenager-dies-after-masturbating-42-times-without-stopping/

In your case I would worry more about pissing off the wrong people.