What was the name of that teen romance movie?

What was the name of that teem romance movie of the 2000s (or 90s) in which in one scene, a guy keeps knocking on the door of a house to prevent another guy there from sleeping with the girl he likes, but then eventually some adults, probably parents arrive and knock on the door and catch the guy off guard. In another scene a guy is laying down with his girl and the girl asks "have you ever done it?" The guy answers "yes, all the time, who hasn't?" and after a pause he says "no" to which the girl says "would you like to do it, with me?", and in another scene, after the girl and boy decide to have sex, the boy is in a shop to buy condoms, but he stutters telling the shop keeper what he wants, instead of "condoms" he says "condensed milk", and when he tries to say "rubber" he says "rubbing alcohol" ?