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Movie about popular virgin couple in high school.

Ok so when I was younger I once watched this movie when I was sick at night.

It was about a high school couple who decided to stay virgins. I think the movie opens with them walking through the school hallways and she was wearing a special backpack. They were pretty popular as well. The guy though didn't want to stay a virgin and later cheated on her at a party. I can remember something about him making out with a girl on the couch? I don't know if this is the same movie (I saw it ages ago) but I think he hooks up with this girl who's wearing a orange tube top with a zipper in the middle. She unzips it and well basically she's naked. Pretty sure she had one of those lava lamps as well in her room.

Must've been a movie from the late 90s or early 2000s.

I've been wondering about which movie this is for ages now so if anyone could help me out, that'd be pretty great :)
asked Jul 16, 2015 in Name That Movie by snow-fairies (1 point)
This is too early, but I thought of "Valley Girl" (1983), a scene with Elizabeth Daily.

https://en.wikipedia.org/wiki/Valley_Girl_(film)

https://www.youtube.com/watch?v=D43xdpFvThs
You reminded me of Bring It on: All Or Nothing
http://www.imdb.com/title/tt0490822/
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