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teens.webmd.com/boys/testicles-faq

Testicles, also called testes or balls, are oval-shaped organs that sit in a sac that hangs behind the penis.. The main job of testicles is to make and store sperm and produce testosterone.Testosterone is the male hormone that's responsible for the changes that occur during puberty.

simple.wikipedia.org/wiki/Testicle

The testicles are firm, oval-shaped glands. Most testicles match in size, but some testicles are much larger or smaller than others. Normal sized testicles are between 14 cm³ to 35 cm³. Most men have one testicle that hangs lower than the other one. Scientists think this may be so that they do not hit against each other.

health.howstuffworks.com/sexual-health/male-reproductive-system/scrotum...

A male's scrotum is very sensitive to touch and can be a source of sensual pleasure. Some men enjoy having their scrotum stroked and fondled during sexual activity with their partner. A gentle massaging of the scrotum from underneath, cupping the testicles in the palm of the hand, is often sensually pleasing to a male.

www.answers.com/Q/How_do_your_testicles_work

If your testicles are still in your abdomen, there are a few techniques that can be used to help massage them down into the scrotum, but it would very likely only work in very small children.

en.wikipedia.org/wiki/Testicle

Testicle or testis is the male reproductive gland or gonad in all animals, including humans. It is homologous to the female ovary. The functions of the testes are to produce both sperm and androgens, primarily testosterone.

www.coloplastmenshealth.com/testicular-implants/function-testicle

The testicles are part of the male reproductive system. 45. The testicles are two oval organs that are located inside the scrotum, the loose sac of skin that hangs behind the penis. The testicles make the male hormones, including testosterone, and produce sperm, the male reproductive cells.

answers.yahoo.com/question/index?qid=20110114105806AASOmqZ

How exactly does male ejaculation work? Okay, so I thought I knew just how this all worked from health class back in high school, but apparently I spaced out during some parts. My boyfriend was telling me that whenever a man orgasms the semen generally only comes from one testicle at a time. So, maybe sometimes whenever he orgasms...

www.coloplastmenshealth.com/erectile-dysfunction/how-does-an-erection-occur

Erections & How They Work. The Penis Has 2 Chambers Called The Corpora Cavernosa. They Are Made Of Spongy Tissue & Can Fill With Blood To Grow In Size.

www.thechaingang.com/blog/scrotum-weights-work

So, do scrotum weights work? The short answer is yes. Ball weights and other devices made for stretching do work. This is why it’s important to use them consistently and this is why you should choose only special devices that are designed for the purpose of ball stretching.