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A 24-year-old member asked:

Why do testicles descend?

2 doctor answers13 doctors weighed in
Dr. Cindy Juster
Pediatrics 37 years experience
Better when cooler.: Testicles can't produce sperm well when they are at 98.6 like the rest of the body. By descending and staying in the scrotum, they stay cooler and can produce sperm.
Dr. Cindy Juster
Pediatrics 37 years experience
Provided original answer
You're welcome-happy to help!
Jan 14, 2012
Dr. Alan Greene
Dr. Alan Greeneanswered
Pediatrics 35 years experience
Cold storage: It does seem odd to put something so precious and vulnerable dangling outside the body, but sperm storage and rapid sperm production are best and safest below body temperature. Reflexes raise and lower them to keep the temperature just right, including heating during sex for sperm activation. Pain - even at the thought of testicle injury - helps protect them out in the open.

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Last updated Sep 29, 2018

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