When people are talking in romantic setting, sticking out the tongue can be a sign of lust. By oneself, pretty much the only thing the tongue can lick is the lips (although a more hidden way of this is licking the teeth).
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Getting to the baseline can take as little as three minutes.
Ask your date an easy question like what he wanted to be when he grew up or his greatest passion.
Tongue body language Sticking out | Licking | Biting it | Inside the mouth | See also The tongue is normally important in spoken body language.
In practice it can also send some body language non-verbal signals.