Research suggests that many married men and women -- and even unmarried ones in serious relationships -- admit to flirting with other people. Now, flirting could mean anything from exchanging glances and smiles to complimenting what someone else is wearing. As we know, you don't even have to talk to someone to engage in flirting. So why is it that so many people who are married or in serious relationships do this? My theory is as follows: As much as we may love our partners, human beings get a tremendous high from being fancied by other people -- especially ones we find physically attractive. Let's face it: Even if we find our partner to be the most attractive person in the world, we can't help but feel physically attracted to others. While some people can keep the attraction they feel to themselves, others resort to the only way they can subtly convey it without full-blown cheating: flirting. I think people do this because sometimes they want to feel desired by s...