To me, castration edgeplay and penectomy edgeplay is sort of the same death-wish thrill (at least in appearance) that you see in some of the crazy solo apnea/breathhold videos — it plays on a very, very fine line that if you cross it, your life will never, ever be the same again (but as you can see, there are many healed scars as well as the fresh injuries in the photos). In any case, I guess you could say the same thing about rockclimbing in terms of risky play that people find fulfilling.