Hot Bubblegum(1981)

Further adventures of Bobby, Benji, and Huey in their pursuit of sex in the 50's. While preparing for their final exams, they try to work out if it's better to be going steady with one girl, and if changing girlfriends all the time leads to too many complications. This leads to frustrations with girls who wont go all the way, and problems with girls will go all the way with anyone!