Mar 11, - The penis is the male sex organ, reaching its full size during puberty. In addition to its sexual function, the penis acts as a conduit for urine to leave the body. Glans (head) of the penis: In uncircumcised men, the glans is covered with pink, moist tissue called mucosa. Covering the glans is the foreskin (prepuce). May 27, - We took tintypes of men's penises and asked them how they felt about One Twitter commenter argued that "a closeup of a flaccid penis being.