What is the name of this movie?

Okay it's been like maybe ten years since I've seen this movie and I'm going to try not to sound crazy when I describe it...I remember bits and pieces of it. It's a moive and it has the settings of the movie like grease or cry baby..Of course there is the bad boy with the motorcycle and the girl has brown hair and he goes away on the motorcycle thinking he isn't good enough for her but she follows him and finds him in this big open field or something and then there is this blonde girl with this nerd and in the movie they have sex and parents come and he falls out the window.??? Idk..if u have any ideas please help. its making me crazy.