New Delhi, June 18 -- Indian summers are no longer what they used to be. They start earlier, last longer, and hit harder than they did even a decade ago. For couples planning a pregnancy, this matters more than most people realise. Heat has a real and measurable influence on fertility, affecting sperm quality, hormone balance, sleep, and the timing of ovulation. Understanding how the body responds to sustained heat can help couples make small but meaningful changes during a season that often goes unexamined.

Why does heat affect men's fertility first?

The male reproductive system is built around one essential need: to stay cool. Sperm production happens at a temperature slightly lower than the rest of the body, which is why the testicle...