First it was the paw of a cat, then it was a man's toe. Now, the latest body part being used to unlock Apple's iPhone 5S fingerprint scanner is a nipple.
A number of videos have appeared online that appear to show male and female nipples being pressed onto the phone's TouchID sensor.
The capacitive sensor can be used with any skin part, as long as a heartbeat and body temperature can be detected, to unlock the device.



One owner of the new iPhone 5S said: '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.'
The latest Apple handset comes with technology which means they can be accessed by placing the owner's finger on the control button.
It lets owners register up to five different prints to unlock the phone and pay for apps.
Last week, technology site, TechCrunch, wanted to test the new Touch ID feature using a cat's paw.
After a few false starts, the paw was recognised as one of the owner's five chosen keys and was able to access the phone's content.
The user was also able to use the heel of his palm and his wrist in the experiment which is described as 'a broadening of the definition of what counts as a 'fingerprint'.
Though different parts of the body were able to be registered and then recognised as keys, when trying to fool the phone's software by using the opposite hand than registered access was denied.
The experiment pointed out however that no other animals could be used to unlock the phone as cats have unique fingerprint like paws.
Another technology site, Pocket-Lint, found TouchID is not just a fingerprint sensor, but is also a toe sensor.
Their tests found that a print from a toe was able to unlock the phone perfectly every time




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