Male Internal
Rectum: The end of the digestive tract. The anus contains many nerve endings causing some people enjoy anal sex. We would like to warn you about the dangers of anal sex.
Bladder: A sac within the abdominal region of the human body that stores the fluid waste called urine. The bladder can become involved in an uncommon orgasmic condition called retrograde ejaculation.
Seminal Vesicles: Two small glands next to the end of the vas deferens. They secrete an alkaline fluid rich in fructose sugar which provides nutrition and promotes sperm movement. The seminal vesicle produces the majority of the seminal fluid (approximately 70% of the entire ejaculate).
Vas Deferens: A long, slender tube that carries sperm up from the scrotum into the abdominal region of the male human body, looping around the side of the bladder and terminating near the seminal vesicle. There are two of these tubes, one on each side and they are the tubes that gets cut during a vasectomy.
Ejaculatory Duct: There are two ejaculatory ducts located inside the prostate gland. During orgasm, the various fluids that comprise the semen are forced into the ejaculatory duct. The semen is held there a couple of seconds during the time called "ejaculatory inevitability" before being ejaculated down through the urethra at the time of orgasm.
Prostate: Located at the base of the bladder, this gland is the size of a chestnut. It secretes milky and alkaline fluids, that create a favorable environment for the sperm. Fluids from the prostate comprise approximately 30% of the seminal fluid.
Cowper's Gland: During sexual arousal, this gland secretes a slippery, alkaline fluid that helps to neutralize that acidity of the male's urethra and then appears as a small drop on the tip of the penis. The fluid is sometimes called pre-cum and different men produce different quantities of it. This pre-ejaculate can contain sperm and may cause pregnancy.
Spongy Bodies: The shaft and glans of the penis are comprised of cylinders of porous tissues. These engorge with blood upon sexual arousal causing the penis to become erect.
Urethra: This tube through which urine and semen leave the body.
Epididymis: After being produced in the testicles, sperm are moved to the epididymis, which is located above the testicle. Sperm stay here several weeks, maturing and taking in nutrients.
Testes: Men have two testes, or testicles. Most men have one testicle that hangs lower than the other. Sperm are produced and begin their maturation in the testis. The testicles also produce testosterone.
Scrotum: A loose sac of skin that contains both of the testes and hangs below the abdomen underneath the penis. The distance that the scrotal sac hangs below the body is dependent on temperature: in cold temperatures it moves closer to the body, and in hot temperatures it moves further away from the body. This movement helps keep the testes a few degrees cooler than normal body temperature, a condition needed for most effective sperm production.
Urethral Opening: The opening from which semen (ejaculate) or urine is expelled from the body. Condoms prevent ejaculated semen from entering the female's reproductive tract.
Anus: The opening from which feces are released. Contains many sensitive nerve endings. The anus can be easily damaged by anal sex.