Love on a Horse (1973)

A man and his stepmother swim naked with a horse, hugging and kissing in the water. They climb on top of the horse with the woman in front. She leans far over the horse's neck, raising her buttocks to give her stepson access to penetrate her vagina from behind with his penis. The horse comes out of the water as they continue to have sex, the stepson holding her breasts in his hands and using them for leverage to thrust into her body. The stepmother clutches at the horse's reins and neck in her throes of passion.

A woman imagines herself having sex with her adult stepson. She touches herself to this thought and masturbates to a finish.

A woman walks into her stepson's bedroom at night. She begins gently touching his body. He awakens and they begin to roll around on the bed, touching and kissing. Sex is implied.

A woman removes her top in an attempt to seduce her adult stepson. He pushes her away and slaps her.

The premise of the story is an older man tries to get his son to have sex and a relationship with his youthful stepmother.

A man has sex with his wife in a field. He goes down on her while grasping her exposed breasts.

A young man kisses his stepmother. He chases her and after catching and holding her, he undresses her.