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It seems that the iPhone 5S' Touch ID sensor works with far more than just fingerprints.

This hilarious video shows a tech fan managing to use his NIPPLE to unlock his brand new iPhone 5S.

The video shows the man pressing his phone up against his chest as he uses his right nipple to register a new "fingerprint".

Amazingly, the phone accepts the nipple just fine. Once registered the nipple can unlock the phone as easily as a finger.

The man then passes his phone to a friend, who tries to use his unregistered nipple to unlock the gadget with no success.

The video is quickly going viral, with nearly half a million views in just a few days.

One commenter joked: "And here, we see? a homosapien breastfeeding his beloved iPhone 5S... Truly an astounding feat of human nature."

Another simply quipped: "NiApple?."