Most Helpful Guy
It's literally what girls tend to do, and not guys. That's why almost no one is claiming that "guys want bad girls". Guys actually tend to prefer an girls who are not an sluts, and shy nerdy girl are less likely to be an slut. That said, many popular girls are good looks, so it's likely the main reason that guys would go for them, it's usually not because of their personality.
Most Helpful Girl
this is not true, except on tween tv, so i can't answer.