Neil,
Thank you for sharing this information. The “icing testicles” theory may come from the fact that testicles require a temperature lower than body temperature to produce sperm https://www.maleinfertilityguide.com/excessive-heat , hence the need for a scrotum. However, I saw no evidence that icing helps; reducing heat exposure (stopping truck driving, reducing hot tub use) have been recommended.
In addition to the healthy lifestyle factors you mention to reduce risk, a frequent exposure that has been shown to increase risk of infertility is PFAS, or “forever chemicals”, which are now ubiquitous and associated with male https://pubs.acs.org/doi/10.1021/envhealth.5c00655 and female infertility
Best wishes,
Margaret
Margaret Winker, MD
eLearning Program Director
Trustee
World Association of Medical Editors
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HIFA profile: Margaret Winker is Trustee and Past President of the World Association of Medical Editors (WAME) and Director of the WAME eLearning Program. She is based in the US. Professional interests: WAME is a global association of editors of peer-reviewed medical journals who seek to foster cooperation and communication among editors, improve editorial standards, promote professionalism in medical editing through education, self-criticism, and self-regulation, and encourage research on the principles and practice of medical editing. margaretwinker AT gmail.com