Plan Bart (2014)

2014

A chick breaks up with her boyfriend and has sex several times with her ex-boyfriend to impregnate her. She gets pregnant, and after she and her boyfriend get back together, she still kisses her ex-boyfriend.

Possession (1981)

1981

A young wife left her family for an unspecified reason. The husband determines to find out the truth and starts following his wife. At first, he suspects that a man is involved, and there is. But gradually, he finds out more and more strange behaviors and bizarre incidents that indicate something more than a possessed love affair.

Deep End (1970)

1970

15-year-old Mike takes a job at the local swimming baths, where he becomes obsessed with an attractive young woman, Susan, who works there as an attendant. Although Susan has a fiance, Mike does his best to sabotage the relationship, to the extent of stalking both her and her fiance.