Can you use your nipples to unlock your iPhone 5S? Look at this guy

If true, this is really weird. This video shows a Japanese iPhone 5S user using his nipples to lock and unlock the new iPhone 5S, which has a fingerprint sensor built-in. Apparently, the sensor works on nipples and toes!


It looks real, but it can be some trick—like a another guy putting his finger inside the shirt. Can any iPhone 5S user confirm that this is true or just a trick?