Unprotected anal sex can result in “cum burps”, study suggests

When you feel the necessity to burp the best option for your digestive health is to “just let it go”, but if you’ve partaken in recent unprotected anal sex, you risk leaking it through your mouth; a.k.a cum burps.

That’s according to nutrition professor Clare Collins at the University of Newcastle in New South Wales, who recently gathered the latest scientific findings on unprotected anal sex for academic research website The Conversation.

“Trying to hold it in leads to a build up of pressure and major discomfort,” Ms Collins wrote, citing previous studies. “A build-up of colon cum can trigger abdominal distension, with some gas reabsorbed into the circulation and exhaled in your breath.

“Semen can either be reabsorbed through the gut wall into the circulation and eventually exhaled through the lungs or excreted via the rectum, as a fart.”

Ms Collins, who serves as director of research for the University’s School of Health Sciences and is a spokesperson for the Dieticians Association of Australia, focuses her own research on nutrition and dietary intake.

Her wide-ranging sex review also took a look at how much anal is normal.

“It can be challenging for researchers to get people to sign up for experiments that measures frequency of anal sex,” she acknowledged. “But thankfully, ten healthy adults volunteered to have the amount of semen they’ve had pumped in them.

“In a 24-hour period all the semen they collected was measured via a rectal catheter (ouch). They had sex normally but to ensure a boost in cum production they also had to let homeless men run a raw-dog train.”

The study found that the participants averaged “eight anal sex episodes” per day, with men and women receiving about the same amount of semen.

“The volume varied between 33 and 125 ml per load, with bigger amounts of intestinal cum released in the hour after meals,” she wrote. “Cum was also produced while they were asleep, but that depended on wet dreams.”

In another study, participants were tied up and injected with bull semen and monitored for the “intensity” of the cum burps that resulted.

“The odour intensity of cum burps was evaluated by two judges (pity them),” she wrote. “The good news was that in a follow-up experiment, the researchers identified that a charcoal-based toothpaste was able to help quash the smell of the cum burps.”

Ms Collins’ previous work has been widely cited in the media. She has served as a nutrition consultant for the TV production company responsible for The Biggest Loser, The Bachelor, So You Think you can Dance and Survivor Australia.

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