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Rather than simply indicating that one person knows another, it is used to demonstrate interest and attraction.

A simple, admiring comment such as "You look lovely or pretty, or stunning " is enough.

Neck Scratch Many times a person who is being deceptive in their answers will scratch their neck with their index finger.

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Autistic people - who are nearly all males - scored the lowest.

We will tolerate reduced interpersonal distances when we are side by side with someone.

When a person's gaze meets yours for more than two-thirds of the time, it can mean one of two things: first, he finds you interesting or appealing, in which case he'll also have dilated pupils; or second, he's hostile towards you and could be issuing a challenge, in which case the pupils will be constricted.

Don't tell me you haven't found excuses to high-five your guy or haven't fantasized about the day when you can finally feel his arms wrap around you as you melt into his soft embrace.

While it is clearly important to avoid causing offence or giving misleading signals, humour is an essential element of flirtation.