Charm is something you're born with, but there's always room for improvement. Hone your flirting skills here!

Mouse = Walk/Run
Click = Flirt
To start flirting, click a guy's head. Click and hold to fill the guy's Flirt Meter. If a rival starts flirting with him, you'll need to click fast to outcharm her. When the Flirt Meter is full, you'll get 1 Love Point.
When walking or running, avoid obstacles. If you hit them, you'll lose Stamina. If you run out of Stamina, you'll lose 1 Love Point.
Don't flirt with the wrong guys; that will also deplete your Stamina.
As you progress, you'll be able to buy upgrades to your charm repertoire.