Physical Fitness Well-Being and Care Male Genitals

About physical fitness, medical information, trivia, anatomy, well-being and care of male genitals including penis, scrotum, and testicles.



Part of a man's sexual system is outside the body, part is inside. Outside are the penis, the testes, and the scrotum, which contains the testes. Inside the body are the prostate gland, seminal vesicles, and tubes that line one part of the system with the other.

Inside the scrotum, each testis is about 1 1/2 in. long and 3/4 in. across.

Each testis has about 250 separate chambers. These contain convoluted tubules, all of which eventually empty into tubes leading back into the man's body.

Sperm is produced and held within the testes. Each sperm is about 1/500 in. long and takes between 60 and 72 days to develop.

Testes are located outside the body, suspended within the scrotum, in order to control the temperature of the sperm. Sperm production occurs only at about 4 deg. below normal body temperature. A higher temperature not only prevents production but also kills sperm in storage.

The penis contains three chambers which begin inside the man's body and extend outward to the tip of the penis. Two of the chambers lie side by side. The third contains the urethra and runs the full length of the penis shaft. When sexually stimulated, these three chambers fill with blood, causing the penis to grow in length and become hard.

Normal penis sizes cover a wide range. Most are between 3 1/4 and 4 1/4 in. when soft. The smallest functioning penis in medical records was less than 1/2 in. long when erect; the largest was slightly over 12 in. Most erect penises are between 5 and 7 in. long and from 1 1/4 to 2 in. thick.

Penis size has no direct relationship to either the ability to reproduce or give sexual satisfaction.

Sperm produced in the testes travel through a tube called the vas deferens up into the man's body toward his bladder. At that point they join with the seminal vesicles, where the thick fluid called semen is produced and stored. Upon sufficient sexual stimulation, the semen carries the sperm down through the urethra and out the penis. This is the process of ejaculation.

Somewhere between 150 million and 400 million sperm are ejaculated each time. The amount of seminal fluid which is ejaculated varies from about 3/4 of a teaspoonful to approximately four times that amount after prolonged abstinence.

The sexual arousal of a man depends on both physical and psychological stimulation. Likewise, the man's sexual response, like the woman's, can normally be inhibited by psychological distractions, a cold, tiredness, illness, or worry. Most men require a rest period between orgasms. This period is highly individualized, ranging from minutes to weeks.

During orgasm, a man's heartbeat rate and breathing rate can rise to as much as 2 1/2 times the normal level.

The period of time between sexual arousal and orgasm covers a very wide range in men. The duration depends on many things, both psychological and physical.

After a long period of abstinence, many men will ejaculate quickly after arousal. Likewise, a new sexual partner, emotional tension, or unfamiliar surroundings can cause a man to have a fast ejaculation. Methods for achieving longer duration between arousal and resolution can be learned. (For further reading: Masters and Johnson, Human Sexual Inadequacy.)

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