TSA Can Actually See if You Have an Erection!

Airport full-body scanners, using millimeter-wave imaging, are designed to detect unexpected shapes beneath clothing. Recently, several travelers have been startled when these machines flagged their groins, not for contraband, but for natural bodily conditions. One man reported that a minor erection from saying farewell to his partner triggered a prominent alert on-screen.

This was during a routine security sweep at Reno–Tahoe airport. But, is he the only one who has experienced this?

Unusual Alarms at Security Checkpoints

Another passenger shared his experience dubbed “swamp crotch,” where excessive perspiration in the groin area set off the alarm, even without any metal or hidden items. These moments led to private pat-downs, leaving travelers embarrassed yet relieved to be cleared.

Why Natural Anatomy Can Trigger Alarms

Millimeter-wave scanners detect anomalies by highlighting areas that differ from expected body contours. Moisture—such as sweat—or an erection, can appear irregular and prompt the machine to flag those areas for manual screening. TSA officials say the system is calibrated to scan across all body types, but abnormalities like increased moisture, thicker tissue, or unexpected shapes can lead to additional checks. This includes both men with erections and women wearing feminine hygiene products.

Traveler Experiences Shared on Reddit

Reddit users have detailed these unexpected pat-downs, describing their embarrassment yet empathy for TSA officers. One recounted being told that the alert was due to a “slight chub” and was assured the response was purely procedural. Another joked that the scanners functioned like “electronic pecker checkers.” Despite the awkwardness, both expressed understanding and relief once agents confirmed no threat.

TSO professionals and posters in the TSA subreddit note that any unusual shape—even an erection or sweat-affected tissue—will prompt a pat-down under protocols. They remind travelers it’s a safety measure, not an insult.

Policy, Privacy, and Passenger Comfort

Since 2013, scanners in the U.S. have produced generic body outlines with specific areas highlighted, rather than detailed images. Agents conducting pat-downs are same-gender certified, and privacy protocols prohibit unauthorized recording during screenings. However, passengers remain uneasy about body privacy and potential misunderstandings.

As scanners remain in widespread use, airlines and security agencies could improve public awareness by including guidance on how natural states—like an erection or sweating—might trigger alarms. Educational prompts could help passengers prepare mentally and reduce anxiety during screenings.

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