Why do men's penises shrink when exposed to cold?

Preserve sperm

It's also for a good cause, explain the specialists at Boston Children's Hospital on their website, Young Men's Health: "The temperature of the penis and testicles is tightly regulated to protect the sperm [...]. If it's hot outside, they will detach from your body heat, and if it's cold outside, they will move closer together (and appear smaller) to stay warm."

If you notice that your penis and testicles shrink in the cold, this is perfectly normal. They will return to their usual size and volume as soon as you are in a warmer room. If not, don't hesitate to talk to your doctor.

And what about women?

If men have a "winter penis," do women have a "winter vagina"? In 2018, a rumor circulating online linked cold, dry air to vaginal dryness. It baffled specialists and was refuted on her blog by Canadian gynecologist Dr. Jen Gunter: "Air doesn't even penetrate the vagina, and vaginal moisture has nothing to do with the environment [...]. The human body is a mystery, especially vaginas. Which are delicate. That's all you need to know."

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