On average, the human body can produce about 1,000 sperm with each heartbeat, equating to tens of millions daily.

Phi, 38, underwent a pre-remarriage check-up and discovered he had azoospermia, necessitating surgery to retrieve and freeze sperm to preserve his chance of having children.

I often work outdoors in hot weather. Can high temperatures reduce sperm quality and affect fertility? What precautions should I take? (Manh Quan, Ho Chi Minh City)