I have the original movie AND the book!
Scared my little self in that movie, but then, B&W scary movies are the best!
Actually, the original manuscript was discussing "Invasion of the Body's Natures", which talked about how teenage hormones caused disruptive changes in the way young people see themselves and the things that are happening in their lives.
Of course, after Hollywood got done with the writing, it was somewhat different.
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(Truth Factor = zero)