Flirting is very risky for guys.
Its ok for women to flirt though. For example a woman can say, "My what strong hands you have. I never would have been able to lift that myself." And the guy would just be like, "Thanks"
..but if I guy says something like, "My what beautiful eyes you have. I bet you can spot a whale from half a mile away." The girl might be like, "Get away from me creep!"