The Situation: Your friend loves sex—but she's not exactly tied down to one guy, and even when she is, one fact remains constant: She loves giving oral, and she always swallows. No shame in that, you think—to each her own. But what about all that man juice? The Reality: Semen is made up of the same harmless nutrients, minerals, and sugars that you probably eat every day—stuff like vitamin C, potassium, calcium, and fructose. Sperm cells actually account for a very small portion of semen. Still, it can't replace your peanut butter protein shake: A man only produces about a teaspoon of semen per orgasm, and that's not nearly enough to provide any health benefits—even if you're getting it daily.
It's mostly made up of harmless nutrients—so how bad could it be?
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A leading blog on the science of sex, love, and relationships, written by social psychologist Dr. Justin Lehmiller. Good question! First, if you perform oral sex on a man who has an STI e.
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