The testes (singular: testicle) are the organs that produce sperm. Unlike the ovaries, they are located outside of the body in the scrotum. This is to achieve temperature regulation necessary for optimal sperm production, as a normal body temperature is too warm for this. As the testicular temperature drops, the testes are drawn closer to the body for additional warmth. As the testicular temperature increases, the testes lower away from the body in order to cool off.
- Wile, Dr. Jay L. Exploring Creation With Biology. Apologia Educational Ministries, Inc. 1998