Taboo (1980)

When Barbara Scott’s (Kay Parker) husband leaves her, blaming her frigidity for destroying their marriage, she’s left alone, without a source of income, and charged with taking care of their teenage son, Paul (Mike Ranger). Feeling vulnerable, she turns to her friend Gina (Juliet Anderson) who opens Barbara’s eyes to the secret world of suburban swingers. But as erotic tension grows, Barbara begins to fantasize about her handsome son…