1. Urinary Bladder; 2. Pubic Bone; 3. Penis; 4. Corpus cavernosum penis; 5. Glans penis; 6. Foreskin; 7. Urethral opening; 8. Sigmoid; 9. Rectum; 10. Seminal vesicles; 11. Ductus deferens; 12. Prostate gland; 13. Bulbourethral gland; 14. Anus; 15. Ductus deferens; 16. Epididymis; 17. Testicles; 18. Scrotum
General – Male Genitals
Humans belong to the mammal class since the fetus develops in the woman's uterus until its birth and then suckles from birth. A male has two testicles that produce spermatozoa (sperm cells). The testicles are located in the scrotum, which is external to the body. Each testicle has a duct that leads the sperm cells to the outside. This duct in known as the ductus deferens. Along the duct there are bumps that produce the semen. The bumps are known as seminal vesicles and the prostrate gland. Two ducts (the ductus deferens and the urinary bladder) combine at the end to form a duct known as the urethra, which is in the penis – the male genitalia.
The penis is the male genitalia, however, most of us use the less official name "dick". The penis is used to have sex and to urinate. When urinating, the urine passes through the urinary bladder to the urethra, which is in the center of the penis, where it is let out. When having sex, the penis is stimulated, gets filled with blood and hardens to what is known as an "erection". Upon sexual release, the penis ejaculates sperm cells in semen.
The size (length and girth) of the penis changes for every man, but as long as it is in the normal range, the size does not necessarily influence sexual function. The penis barely grows from birth until puberty (about age 12).
The testes are glands that are part of the male sexual and reproductive system, and their role is to create sperm cells and male sex hormones, mainly testosterone. The testicles produce sperm cells and hormones uninterruptedly from the age of sexual maturity.
Males have two testicles, which are suspended in the scrotum, which is located outside the pelvic cavity and under the penis. The location of the scrotum being outside the body allows for the proper temperature conditions required to properly produce sperm cells to exist. When the testes’ temperature is high (for example, when a man wears tight fitting underwear), their ability to produce sperm cells is affected, and so is the quality of the sperm produced. When the temperature is too low, a reflex is automatically activated to raise the scrotum towards the body in order to raise the temperature (that is why the testicles shrink in cold water). The roles of both testicles are identical and they are not influenced by one another. Even though they are called testicles, we simply call them "balls".
What are blue balls?
In slang, "blue balls" refers to a situation in which there is pain in the region of the testicles due to prolonged sexual stimulation that does not result in an orgasm or in ejaculation. As of 2009, this phenomenon has not been sufficiently researched and there is not enough information about it.
After prolonged sexual stimulation without ejaculation, there is an accumulation of blood and lymphatic fluid in the tissues of the penis, testicles and prostate, and the oxygen content in the blood decreases, a situation referred to as engorgement of the blood vessels. Men who suffer from chronic, severe, or prolonged blue balls or from a prolonged erection (erection without any stimulation for more than four hours) should seek medical attention.
How to treat blue balls?
The simplest treatment for blue balls is to ejaculate either through sex or through masturbation. Ejaculation stops the engorgement by returning the flow of fluids in the genitalia back to the body.
In certain cases, the engorgement and accompanying pain stop within about an hour even without ejaculation, however, in certain cases it can even take longer than that.
The prostate gland produces a secretion that forms about one third of the composition of semen – a thin, white and basic fluid that gives the semen its unique smell. The fluid contains enzymes that prevent clotting of the sperm, which is essential to its vitality.
The seminal vesicle is a gland that connects to the ductus deferens and produces the part of the semen in which the sperm cells are located. Men have two seminal vesicles, one on each side.
The urinary bladder is a sac-like muscular organ located in the pelvis that stores the urine filtered form the blood in the kidneys. The urine reaches the bladder trough the ureters, which exit the kidneys. The release of the urine from the bladder is controlled by a valve that is close to the upper part of the bladder. For men, the length of the urethra ranges between 15-25 centimeters and passes through the prostate gland along the way until the opening of the urethra in the glans penis.
The anus is the external opening of the rectum, which is located at the end of the large intestine. It opens and closes via two ring-like muscles, through which stool is excreted from the digestive system. The coating of the anal duct bruises easily by hard stool. The duct is padded with a mucous membrane. The skin of the anus contains milk and sweat glands.
The anus also has a role in human sexuality. During anal sex, the male genitals (or a sex toy) penetrate the anus into the rectum, thus stimulating the nerve ends of the vagina for women and those of the prostate for men, both areas that are close to the back end of the rectum.
The rectum is the end part of the large intestine. This is an organ that is duct-like and measures 17 centimeters in length. It is connected to the anus through a small and thin duct, called the anal duct. As the last organ of the digestive system, the rectum serves as a collector of waste created in the large intestine until the stool is excreted.