People in monogamous relationships catch sexually transmitted diseases just as often as those in open relationships, a new survey suggests, largely due to infidelity spreading infections.

Reported in the current Journal of Sexual Medicine, the survey of 554 people found that monogamous couples are less likely to use condoms and get tested for STDs — even when they’re not being faithful to their partner.

“It turns out that when monogamous people cheat, they don’t seem to be very good about using condoms,” Justin Lehmiller, a psychologist at Ball State University and author of the study, told BuzzFeed News by email. “People in open relationships seem to take a lot of precautions to reduce their sexual health risks.”

The finding matters because people who think they are in monogamous relationships may face higher odds of an infection than they suspect, Lehmiller and other researchers told BuzzFeed News. And a stigma around open relationships that views such couples as irresponsible — even among researchers who conduct studies — may be skewing the evidence.

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