Here's a bit more about it:

* Location: The testes are located in the scrotum, a sac of skin that hangs below the penis.

* Function: The testes have two main functions:

* Sperm production: Tiny tubes within the testes called seminiferous tubules are where sperm cells are produced.

* Testosterone production: Leydig cells within the testes produce the male sex hormone testosterone.

* Process: The process of sperm production is called spermatogenesis. It takes about 64 days for sperm to mature.