Gangbang Girl 3 (1992)

Ms. Diamond is a young professor at university, during a session about abnormal psychology she talks about deviant Sex and takes "Group Sex" as an example, and she asks her students to perform it on her inside the classroom to better explain the lesson. later on she tells her therapist that 3 weeks ago in Union Station, she offered her self to every man using the train station toilets while her girl friend was there with her watching her being used by a lot of strangers. she also tells him about her dream where she gives oral pleasure to multiple masked men and drink their semen from the filled condoms. Her therapist suggest to her that as a final test she should attend a party full of men and she should hold her self with them otherwise she's a hopeless Nympho by nature, but she ends up being Gangbanged by everyone there including her step-brother and even her therapist.