Penile subincision is a form of genital modification involves a urethrotomy and vertically slitting the underside of the penis.
Pearling or genital beading is a form of body modification, the practice of permanently inserting small beads made of various materials beneath the skin of the genitals—of the labia, or of the shaft or foreskin of the penis.
Penis splitting, known clinically as penile bisection or genital bifurcation, is a type of body modification. There are several techniques used.
Urethral stimulation in its most basic form as the insertion of a steel rod down the eye of the urethra isn't considered to be a body modification. It is considered to.