It is a very special organ, present only in males. It’s main function is to hold urethra, which controls urine. And it also holds two muscular cylinders which control the vital function of achieving erection of penis, necessary for successful sexual act.
Prepuce is a foreskin covering the bulb of penis distally. It is this part of skin, which is removed during religious or medically warranted circumcision.
Prepuce can get affected by infection, narrowing, stones within, and malignancy
(cancer).
Penis can get affected by skin lesions of the covering skin, fibrous plaque of the muscular cylinders of erection, narrowing of the contained urethra, and curvatures of penis.