Why too much warmth is bad for the human testis?

Excessive warmth negatively affects the human testis primarily because the optimal temperature for sperm production is slightly lower than core body temperature. Elevated temperatures can impair spermatogenesis, leading to reduced sperm quality, motility, and overall fertility. Additionally, prolonged exposure to high temperatures may cause damage to the testicular tissue, resulting in hormonal imbalances and potential infertility issues. Thus, maintaining a cooler environment is crucial for healthy testicular function.