Male Reproductive System

HowStuffWorks answers your questions about parts of the male anatomy and how they function. Learn how the different parts of the male reproductive system work in this section.

A study showed a decline in male dog fertility over 26 years, which researchers think may be due to chemicals in the environment.

Study shows longevity is increased by castration.

A long-held belief about sexuality is that men hit their sexual peak in their 20s. Does it all go downhill from there? Don't panic, guys -- you have biology on your side.

Superficially, men's bodies remain largely unaffected by their children's births, but that doesn't mean that they're untouched by parenting on a deeper level. How can childrearing affect dads' testosterone levels? And does it make them less manly?

Ah, testosterone, the male hormone with the bad-boy reputation. But does it really cause aggression in men? Do women also secrete testosterone in their bodies? Find out what else women need to know about male hormones.

If you're like most men, you'd rather ignore the pain than go to the doctor and talk about pain "down there." But in many cases, trying to pretend the pain away could mean worsening your problem -- even to the point of needing your testicles removed.

Testosterone and estrogen are actually very closely related in the body, and maintaining the balance of these hormones is key to preventing health issues. Learn about proper testosterone and estrogen balance in men.

What is the definition of circumcision? Learn about the origins, risks and benefits of circumcision.

What is the definition of ejaculation? Learn about what's happening during ejaculation and its purpose in reproduction.

What is the definition of an erection? Learn what's happening during an erection and how dysfunction occurs.

What is the definition of penis? Learn about the anatomy and physiology of the penis as part of the male reproductive system.

What is the definition of the prostate gland? Learn about the anatomy and physiology of the prostate gland in the male reproductive system.

What are the definitions of PSA and PSA testing terms? Learn about PSA and PSA testing for monitoring prostate gland health.

What is the definition of scrotum? Learn about the anatomical function of the scrotum as a part of the male reproductive system.

Ah, puberty -- perhaps the most awkward time in a boy's life, when hair sprouts in odd places, voices crack and acne makes its unwelcome appearance. What's going on inside the body of a pubescent boy?

Would you jump off a bridge if all your friends did? What if your friends were all circumcising their sons? See if there's a medical reason for slicing off foreskin -- or if we're nurturing an outdated, barbaric practice.

The male reproductive system consists of those structures in the male body designed to create life. The system includes the testes, a network of ducts, seminal vesicles, the prostate gland, and the penis.

What is the definition of blue balls? Learn what the slang term 'blue balls' means, how it is used and where it originated.

Whether to opt for circumcision is up to personal preference. Learn about the reasons to reconsider your circumcision preferences.

What is the definition of premature ejaculation? Learn about the causes of premature ejaculation and methods of treatment available.

What is an erection self-test? Learn more about who is a candidate, how it is performed and what the result mean in this article.

Sexual health is just as important as mental and physical health. Get answers to all of your sexual health questions with the help of this article.