Human penis - wikipedia, the free encyclopedia, The human penis is an external male sexual organ. it is a reproductive, intromittent organ that additionally serves as the urinal duct. the main parts are the root. Penis - wikipedia, the free encyclopedia, A penis is the primary sexual organ that male and hermaphrodite animals use to inseminate sexually receptive mates (usually females and hermaphrodites respectively. Bbc - science & nature - human body and mind - body, Learn all about your body with bbc science & nature's guide..