What is flirtation?

According to Milan Kundera's observations in The Unbearable Lightness of Being,

"One might say that it is behavior leading another to believe that sexual intimacy is possible, while preventing that possibility from becoming a certainty. In other words, flirting is a promise of sexual intercourse without guarantee.”

He also notes,

“Making love with a woman and sleeping with a woman are two separate passions, not merely different but opposite. Love does not make itself felt in the desire for copulation (a desire that extends to an infinite number of women) but in the desire for shared sleep (a desire limited to one woman).”

SO i guess flirting with sex is an oxymoronic act, and spooning after sex is a milestone in relationships - as Carrie felt in s.a.t.c.