A recent Harvard study found men who wore boxers had about 25% more sperm than those who wore briefs

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Following is a transcript of the video.

Boxer shorts were introduced in the 1920s for, well, boxers. The underwear were loose around the legs, giving boxers the freedom they needed. Then, about a decade later, briefs came into the world,

Offering a sleeker, tighter fitting option, and also launching into effect that age-old question: boxers or briefs? And it turns out, there might be a clear winner, after all.

Yes, wearing tighty-whities can lower your sperm count.

You read that right: wearing tight underwear can lower your sperm count. Turns out, if underwear is too tight, it pushes the testicles closer to the body. Increasing their temperature in the process. And that’s bad news for the sperm inside. You see, a man’s sperm production is at its best when his testicles are cooler than his core body temperature 2 to 4 degrees Celsius cooler, to be exact.

That’s why the testes hang down, away from the body, for most mammals. So when you wear tight underwear, the resulting increase in temperature can damage the sperm, and potentially your fertility as well. Scientists have been studying this link between body heat and fertility for years, several studies show that men who