[Pseudoscience-is-malarkey (OP)]

Or is the scrotum damaging effects of wearing tight jeans a myth? The stuff of unfair judgment and parody we place on the 1980s such as pedophile mustaches, aviator sunglasses, male form-fitting shorts, hairy legs, mesh caps, voracious meat-eating, and early heart attacks?

[evan_au]

For best fertility, the temperature of the testes need to stay a few degrees below standard body temperature of 36-37C .
- Tight clothing, lots of time in a spa, and using a laptop computer in the eponymous manner are both likely to raise the temperature of the testes.

See: https://en.wikipedia.org/wiki/Testicle#Temperature_regulation