When a man and a woman meet for the first time, both are in a difficult, ambiguous and potentially risky situation. Neither person knows what the other’s intentions and feelings are. Because stating intentions and feelings verbally involves a high risk of embarrassment or possible rejection, non-verbal behaviour becomes the main channel of communication. Unlike the spoken word, body language can signal invitation, acceptance or refusal without being too obvious, without causing offence or making binding commitments.

Warning: some of the non-verbal flirting techniques outlined in this section are very powerful signals, and should be used with caution. Women should be particularly careful when using signals of interest and attraction. Men already tend to mistake friendliness for flirting; if your signals of interest are too direct and obvious, they will mistake them for sexual availability.