It's gotta be the sex. Otherwise, what in the name of nanotech would a guy with Tony Stark's looks, genius, fortune and personality have hooking up into any kind of romantic relationship with some of the women that he's been connected to over the years? Just looking at the first volume of his series and our guy's dated mobsters, stalkers and Russian spies. For someone considered a playboy, our hero seems prone to offer his heart or at least his romantic intentions to women