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Lynn is Kyle's girlfriend
Aside from more or less unimportant story extensions the main difference is the character of Staci Moon, a textbook example of a partygirl that never misses a chance to make out with other men in front of the eyes of her husband. The theatrical version completely drops the fact that Jackie even has a wife. Beside that there is more nudity in the unrated version. A detailed comparison with pictures can be found here.
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