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The Penis

Some things you should know about your genitals:

  • The shaft of the penis contains three cylinders of sponge-like tissue. During arousal these fill with blood, producing an erection. The ‘glans’ (head) is loaded with nerve endings, making it extremely sensitive to touch, particularly during arousal.
  • The ‘corona’ is the flared part of the glans where it meets the shaft and for many men is the most sexually sensitive part of the penis.
  • The testicles are part of the body’s endocrine (hormone) system and produce the primary male sex hormone, testosterone.
  • During puberty, the testicles produce a large amount of testosterone, which stimulates sperm production and causes the voice to deepen, muscles to develop and hair to grow on the face and the body.
  • On average, the testicles produce approximately 150 million sperm each day.
  • It only takes one sperm to get a woman pregnant.
  • The size of a penis bares no relation whatsoever to man’s fertility. A normal ejaculate contains more than 40 million sperm.
  • The optimum temperature for sperm production is three to five degrees cooler than body temperature. This is why the testicles hang outside the body.

Warning! The following image shows a detailed cross section diagram of the male sexual and reproductive organs.

Click here to view the images

Warning! The following images show the male genitals in graphic detail. Here we demonstrate, through a gallery of photos, wide variations in the genitalia of normal healthy men. Differences in sizes and shapes of genitalia should not be a cause for alarm or concern. Parental guidance is recommended.

Click here to view the images


Otherwise known as a ‘hard on’. This is when the penis gets stiff / hard. Erections are controlled by emotional, physical and hormonal signals which means that you can’t necessarily control them yourself – sometimes they have a mind of their own!


Otherwise known as your ‘balls’, the testes produce testosterone (hormones) and sperm. Sperm is also stored in the testes and it fertilises an egg to make a baby.

Testosterone is responsible for causing;

  • A deep voice
  • Beard growth
  • Muscle development
  • The ability to have an erection
  • A sex drive (the feelings you have about wanting sex)

Prostate Gland

This is a bit of a mystery but the prostate is found between the bladder and the penis, wrapped around the urethra (the tube which urine flows from the bladder – and therefore is commonly known to help with urine flow). This is a major design flaw because as you get older the prostate naturally starts to enlarge. This squeezes the urethra and interferes with urinary flow. When they enlarge it can cause infection (common 25-45yrs). Prostate cancer is most common over 55yrs.

The World Health Organization (WHO) estimates that 80% of men will eventually need treatment for prostate problems. One in three will need an operation.

A healthy prostate gland is the size and shape of a large chestnut. It is made up of millions of tiny glands that secrete a thin, milky, acidic fluid. The prostate also contains muscle and fibre cells which help the gland to contract.

The prostate is hidden away between the bladder and the penis, wrapped around the urethra the tube through which urine flows from the bladder.

Three main things tend to go wrong with the prostate gland; each occurs at a different stage in a man’s life:

  • Prostatitis, in which the gland becomes infected or inflamed. This is most common between the ages of 25 and 45.
  • Benign prostatic hyperplasia (BPH), in which the gland slowly enlarges. This commonly causes symptoms after the age of 45.
  • Prostate cancer, which tends to occur over the age of 55 though it can occur much earlier.

The prostate gland helps to direct semen outwards during ejaculation so sperm don’t reflux up into the bladder. This means that the testicles produce sperm (and testosterone), whilst the prostate produces the semen that directs sperm, it helps keep sperm healthy and aids with ejaculation.

Pics and penis facts from Channel 4’s Sexperience website

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