Most Helpful Guy
They flirt with you.
They compliment how you look.
They stare at you... for the most part. I'm the kind of guy who can't help but look at strangely deformed or morbidly obese people too. In their case I am not staring at them because I think they are hot.
They ask you out.
More on the creepy side they cop a feel or cat call you. Best not to entertain these kinds of guys though.
Yes, there is a difference between a friendly compliment about how you look and a cat call.
Most Helpful Girl
Most common is just staring even if u catch them doing it