iPhone 5S owners have discovered that the device's Touch ID fingerprint scanner can be unlocked using nipples, according to videos posted online. The capacitive sensor works with any skin part that has a detectable heartbeat and body temperature, enabling male and female nipples to grant access.
This follows earlier experiments where a cat's paw and a human toe were used successfully. TechCrunch reported that a cat's paw could unlock the phone after several attempts, while Pocket-Lint found that a toe print worked every time.
Apple's Touch ID uses a laser-cut sapphire crystal to scan skin layers. The fingerprint data is encrypted and stored locally on the device, not on Apple servers or iCloud. Users can register up to five different prints.
One iPhone 5S owner commented: 'I'm glad Apple's scanner recognises nipples - it just goes to show how ridiculous the premise is in the first place. Now if anyone tries to mug me, they'll have to cut one of my nipples off if they want to use my phone, and I'm not telling them which one.'
