Its just a way to briefly enjoy the spark of attention from the opposite sex. (Or whichever sex you prefer.) You enjoy a mildly intoxicating social moment, then you move on, go back home to your wife, and have some amazing sex with her.

Why do married woman flirt with me?

Boredom is most commonly the emotion that leads to flirting. As reported by “Psychology Today Magazine,” when women feel that they have discovered everything there is to know about their current partner, they often become eager to engage in flirtation with someone with whom they are less familiar.