Unknown Movie With Fallon

[frecklearms72]

I'm looking for the name of a movie from I think either late 80's or early 9's. All I remember about it is that it starred Fallon and the movie was about her losing her virginity on her 18th birthday. I do remember 2 scenes from the movie where one has her with 2 other women showing her how to masturbate. And the other at the end of the movie has her having sex with a nerd that shows her all kinds of positions to have sex in.

Thanks in advance