Scientists Explain Why We Have Oral Sex

The question of why we have oral sex seems like a no-brainer: because it feels good. But according to a recent investigation by Medical Daily, there could be a few other, less conscious reasons both men and women engage in oral sex.

Apparently, according to a study in the Journal of Reproductive Immunology, swallowing semen can make your body accustomed to someone's DNA so that your immune system doesn't act up during pregnancy. Since a number of pregnancy disorders stem from recognizing the father's genes as foreign, introducing them into your body beforehand can help you out when you're pregnant with his child. It sounds wacky, but scientists believe it's a possible evolutionary explanation for fellatio.

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What about when men go down on women? That practice could've also been inherited from our ancestors. One study in Evolutionary Psychology found that men who perceived that a lot of other guys were interested in their S.O.s were more likely to make them orgasm through oral sex. The authors speculate that the act might function to prevent cheating, which in turn prevents sperm competition and helps men pass on their genes. Don't you just love science?

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Then, of course, there's the fact that oral sex is often a lead-up to intercourse, which has obvious evolutionary advantages.
All that aside, though, the reasons a behavior evolved within a species aren't always the same as the reasons we actually decide to do it. Mostly, we have oral sex because it feels good or we want to make our partner feel good—and that's reason enough.

Source: Smitten