Fever (1982)

Rhonda Jo Petty plays a model who heads off for a sexy photo shoot with a swinging English photographer. But with all the sexy goings-on around the set, it will be a miracle if he can get any good shots at all! And when Rhonda Jo finds out that her man has been cheating on her, she decides to get back at him the best way she knows how -- by engaging in a little lusty interlude of her own!