A good ‘ol deep cleaning—formally known by the Butthole Powers That Be as douching—has long been treated as a prerequisite for anal sex, right up there with anal lube and a little patience. In a society that despises mess, especially messes of the sexual or genital variety, it’s not surprising that people have long considered an unexpected rabbit pellet making a cameo during anal sex to be The Ultimate Bedroom Buzzkill. But, as it turns out, douching is rarely necessary.
“People picture poop just hanging out right inside the anus and expect to encounter a mess every time they have anal sex. But that's not how it works,” Evan Goldstein, DO, a doctor in New York City who specializes in anal care, the founder of Bespoke Surgical, and the author of Butt Seriously, tells Cosmopolitan. “Between bowel movements, stool sits higher up in the colon, mostly in the sigmoid colon, which is just above the rectum, which is above the anal canal,” he explains. It’s generally when you feel that urge to go, go, go that the solids take the escalator down to the rectum and below, he says.
And while that might be reason enough to retire your pre-anal rinse routine, it's far from the only one. Emerging research suggests that all that rinsing and repeating could actually be messing with the delicate ecosystem inside your bum.
Butt Bacteria 101
To fully grasp the impact of cleaning deep inside your derriere, it helps to understand a bit more about the butt itself. I am a journalist with a portfolio that disproportionately features anal play, but I’m neither a butt microbiome researcher nor a gastroenterologist. Thankfully, two were willing to take time out of their lives to explain it to yours truly.
“The rectum and anus are home to their own communities of microorganisms—mostly bacteria—that play a very important role in anal and rectal health,” says anal microbiome researcher and immunologist Nichole Klatt, PhD, professor at the University of Minnesota. “They interact constantly with the epithelial barrier that protects the rectum and anus, as well as the local immune system.” Many also produce metabolites essential for the health of the anal lining, she adds.
More often than not, that microscopic community of bacteria in your backdoor works hunky-dory. But just like any community, things can get a little wonky when its delicate balance is disrupted, Dr. Klatt explains. “The result can be damage to the delicate mucosal barrier, increased inflammation, and increased susceptibility to infections and/or uncomfortable health issues,” she says.
Why Douching Can Disrupt Things
As counterintuitive as it may sound, the very thing people do to get their butts squeaky-clean (anal douching) may be associated with changes to that bacterial ecosystem, according to emerging research.
A March 2026 study published in The Journal of Infectious Diseases suggests that douching before receptive anal sex (a.k.a. bottoming) may lead to a less diverse rectal microbiome. The researchers compared rectal samples from 64 men who douched to those from 27 men who reported refraining from doing so, and found that the douchers had lower bacterial diversity.
Now, the researchers didn’t prove that douching is the cause of these guys' imbalance, nor did they conclude that a lower-diversity biome is synonymous with an unhealthy one. But the findings do raise questions about the potential risks of douching.
Why Douching Leaves Your Butt Worse for Wear
“The rectum is built to store stool and then empty it. It is not built to be pressure-washed,” Sabine Hazan, MD, an award-winning gastroenterologist, gut health expert, and microbiome researcher, tells Cosmopolitan.
The anal canal and rectum are lined with a protective mucus layer that protects those inner tissue and supports the local micrbiome. “Water under pressure, soap, fragrance, essential oils, and coffee [enemas] can all take away that mucus layer," Dr. Hazan says. Meaning, douching doesn’t just wash away lingering poop residue, but also some of your body's built-in protection. As she puts it, “it strips the shield.”
On top of that, douching can physically damage your delicate tush tissues. “The lining is thin, and fluid forced in can cause tiny tears. It can nick the tissues,” says Dr. Hazan. The rub is that compromised canal tissues potentially may leave you more vulnerable to irritation and infection.
In fact, a previous review published in Sexually Transmitted Infections journal suggests that douching practices may affect the rectal environment and STI susceptibility. After pooling findings from previous studies, researchers found that people who practiced rectal douching had higher odds of HIV and other STIs compared with those who didn't douche.
“Some of that is people who may also have more partners,” Dr. Hazan tells Cosmopolitan. “But some of it is biology: raw tissue plus a disrupted community is easier to infect.”
How to Tend to Your Microbiome
1. Eat your way to a happier butt.
“Most of rectal health is decided upstream,” Dr. Hazan tells Cosmopolitan. “Hard stool and straining beat up the cushions that become hemorrhoids and the skin that splits into fissures,” she explains, while softer, easier-to-pass stools can help keep those delicate tissues intact.
The true-and-blue way to keep things moving? Fiber-rich and fermented foods. “Eating a diet rich in fruits, vegetables, whole grains, legumes, nuts and seeds, all of which can support a healthy microbiome,” says Dr. Klatt.
Not only can these foods support your microbiome, but their fiber content can also help keep your bowels moving and grooving consistently. And the more predictable your poops, the less you may feel the need to give your butt a pre-sex power wash.
2. Wipe well, but don’t go wild.
“Clean the outside, but leave the inside alone,” says Dr. Hazan. “If you use paper, pat or wipe gently, front to back, until the paper is clean. Avoid scrubbing, though, which can cause tears,” she says.
Ideally, however, use water to rinse, as it can reduce the friction of repeatedly dry wiping. “A bidet or a handheld sprayer on low pressure, aimed outward, removes residue without sanding the skin,” she says. Just remember: A bidet isn't a douche, so don't go aiming that stream up your seat.
3. If you do douche, do so gently.
Not ready to go cold turkey on your pre-anal sex routine? Fair enough. But you can help minimize potential irritation by being selective about what you put up there.
The cells lining your rectum are sensitive to dissolved-salt concentration, and if it gets too high or too low, water can move into or out of those cells, potentially causing irritation, Dr. Hazan explains. For instance, “plain tap water and soapy water are the wrong salt balance for the cells [lining the rectum] and can damage them,” she says.
A handful of brands like Future Method and #LubeLife have created iso-osmolar douching solutions with a dissolved-particle concentration similar to bodily fluids, designed to minimize this kind of irritation.
“The idea of ‘iso-osmolar’ does have legitimacy,” says Dr. Klatt. Though it is important to remember that this term on packaging doesn’t necessarily mean the product has been tested for rectal/anal health.”
Regardless of what you're rinsing with, resist the urge to go overboard. “One rinse may be all you need. If not, repeat once or twice, then stop,” says Goldstein. “Don't chase crystal-clear water.”
4. Listen to your body
No matter what becomes of your pre-sex ritual, if anal sex is on the menu, make sure your body gets the final say on whether it's ready for play. “Skip anal sex if you're feeling irritated down there,” says Goldstein. If discomfort crops up during the act, don't push through it. “Burning, soreness, cramping, bleeding, or extra mucus mean you should stop,” he says. Finally, “If symptoms stick around or you have significant pain or bleeding, see a doctor.”