In romance, and in finance, a seduction that relies on logic could be a play, shows John Allen Paulos in abcnews.com
Suppose a man flirts with a woman and then asks her, "Will you solemnly promise to give me right now your telephone number if I make a true statement and, conversely, not give me your number if I make a false statement?" ...
The man then makes his statement: "You will neither give me your telephone number now nor will you sleep with me tonight."
What's the trick? Note that she can't give him her number since, if she were to do so, his statement would be made false, and so she would have broken her promise to give him her number only if he made a true statement. (This is the crux of it.) Therefore, she must not give him her number under any circumstances.
But if she also refuses to sleep with him, his statement becomes true, and this would require her to give him her number.
The only way she can keep her promise is to sleep with him so that his statement becomes false. The woman's seemingly innocuous promise ensnares her...
HT: Kajal Chakravarti