Warning: A few NSFW images. Of nipples, and nipple-like things.

Jenny Chang for BuzzFeed

Nipple-gasms are a thing.

"Some people do experience orgasm from nipple stimulation alone," Debby Herbenick, PhD, author of The Coregasm Workout (Seal Press, 2015), tells BuzzFeed Life in an email. "It's rare, but it happens."

Although for some people, the nipples aren't even the most sensitive part of the breast.

Some studies have shown that the tops or sides or bottoms of the breast can be more sensitive for some people, Herbenick says.

Everyone has nipples because of how fetuses develop in the womb: Nipples show up before sex organs (like vaginas, ovaries, testicles, penises) do.

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