Metoidioplasty and Phalloplasty: Options for Masculinizing Bottom Surgery Medically reviewed by Lin-Lin Liu, PA on May 25, 2026. Masculinizing bottom surgery, also known as “FTM” bottom surgery, offers two methods for constructing a penis: metoidioplasty and phalloplasty, often referred to as “meta” and “phallo”. While both of these procedures will create a penis, they vary in aesthetics, sensitivity and function. A metoidioplasty is a procedure that releases the natal erectile tissue, sometimes called a clitoris, from surrounding ligaments to appear more prominent as a penis. A phalloplasty creates a penis, generally larger than that of a metoidioplasty, from a flap of skin taken from the forearm, groin, or thigh.  That …