It's a clip on.
Transsexuals can have them installed now beneath the skin that allows their prosthetic penis to be attached and removed whenever they so please - mainly for reasons of accessibility and aesthetic appeal. This person obviously got theirs fitted early on in the technologies existence so, as with any new pieces of kit, all of the bugs weren't ironed out until later.
What you're witnessing here ladies and gentlemen is just another great example of the wonders of modern science...
:bowdown: