A security company warns a male chastity device allows hackers to take it over and permanently lock users in, requiring "an angle grinder or similar" to free themselves.
The Cellmate Chastity Cage, built by Chinese firm Qiui, is designed to let users hand over control to another person who can use an app to lock and unlock the cage.
But flaws in the way the app communicates with the cage mean "anyone could remotely lock all devices and prevent users from releasing themselves", according to UK security firm Pen Test Partners.
Once delicate and sensitive parts are trapped in the cage, the lack of manual override means removal of the heavy-duty device is extremely dangerous.
"The tube is locked onto a ring worn around the base of the genitals, making things inaccessible," Pen Test Partners warns.
"An angle grinder or other suitable heavy tool would be required to cut the wearer free."
The other option, Pen Test Partners discovered, is to use a sharp jolt of electricity to overload the circuit board that controls the lock.
Several user reviews of the app have already complained bugs have left them trapped inside the chastity cage.
"The app stopped working completely after three days and I am stuck!" one user wrote.
"It worked for about a month until I almost got stuck in it. Thankfully it unlocked itself randomly and I was able to get out of it. The device left a bad scar that took nearly a month of recovery," said another review.
Pen Test Partners security researcher Alex Lomas told The Verge there's no guarantee these products are safe when you buy one.
"It isn't tremendously unusual to find an issue like this in many IoT [internet of things] fields, and teledildonics is no real exception," he explained.
"Both ourselves and other researchers have found similar issues over the years with different sex toy manufacturers.
"I do personally feel that the most intimate devices should be held to a higher standard however than maybe your lightbulbs."