Located in the hollow sac of the scrotum, each testis is about 1.5 to 2 inches long along its long axis and around 1 inch in diameter. (Check your own size).
It may be surprising that the testes should lie in such a vulnerable place outside the body, but it is too hot for them inside.
Spermatogenesis requires a temperature that is three to five degrees Fahrenheit below body temperature. If it becomes too cool on the outside, the cremaster muscle will contract to bring the testes closer the body for warmth. (Stop wearing tight outfits that forces the testes to the body).
The testes are responsible for the production of sperm cells and the male sex hormone testosterone.
The testes produce as many as 12 trillion sperm in a male's lifetime, about 400 million of which are released in a single ejaculation. A man therefore mathematically has 30,000 ejaculations in his lifetime.
If you are the sex crazy type and releases 3 times per day. You would have exhausted your reserve in about 28years.
Guys be careful where you stick your dick. Use your lifeline wisely.

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Female booking space on thread like this,

vickylois:
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vickylois:
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You need some balls?