The penis is traversed by a tube, the urethra , which serves as a passage both for urine and for semen. Pseudohermaphroditism When spotted hyenas were first discovered by explorers, they were thought to be hermaphrodites. The blood supply to the epididymis is by a branch from the testicular artery given off before that vessel reaches the testis. If a banana slug has lost its male sexual organ, it can still mate as a female, making its hermaphroditic quality a valuable adaptation. The small openings of the ejaculatory ducts lie on each side of or just within the opening of the prostatic utricle. Through experience the child learns what behaviour is rewarded and what is punished and what sorts of behaviour are expected of him or her. When the spermatozoon is fully mature, it is propelled by the lashing movements of the tail. The male reproductive system The male gonads are the testes; they are the source of spermatozoa and also of male sex hormones called androgens. The hormones stimulate the growth of about 15 to 20 eggs in the ovaries, each in its own "shell," called a follicle. A simultaneous or synchronous hermaphrodite or homogamous is an adult organism that has both male and female sexual organs at the same time. Mating with a partner is more desirable biologically, as the genetic material of the resultant offspring is varied, but if mating with a partner is not possible, self-fertilization is practiced. The clitoris is covered by a fold of skin , called the prepuce, which is similar to the foreskin at the end of the penis. National Institutes of Health.