Of 14,000 people (whose mean age was about 22 years) included in a study published this morning in the journal Pediatrics, fully 10 percent of those who tested positive for one of three common STDs (chlamydia, gonorrhea trichomoniasis) reported they hadn’t had sex during the previous 12 months.

And 60 percent of that 10 percent said they’d never had sex at all.