Thanks for writing in. Male fertility depends upon the semen analysis which determines sperm count, motility and morphology. Exposure to dry or wet heat can hamper sperm count and motility. Heat has an effect on sperm production.
As your child is still young you can educate him on this.
All the best
It won't cause any permanent damage as sperm production is continuous. As Dr. Veena said, heat will diminish sperm production, but only temporarily. Daily use of the hot tub would keep his sperm count low, but a few days off would bring it back up again. For a whole host of other reasons he should keep his hot tub sessions to less than 15 minutes.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. MedHelp is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.