1970s/80s adult drama set on a farm

Hi so I am looking for assistance finding this film I have been thinking about since I was young. What comes to my mind about the film is that it was made sometime in the1970s” or the 1980 and basically a guy is on a farm or ranch with his grandfather and then a women shows up and sneaks around with sexually behind the old man’s back. There was also a scene where the two was in a car having you know what and almost ran over the old man. There is another scene when they took a shower and he fist pump his hand to sky celebrate having you know what with her. All and all I know it came on cable with those late night x rated shows and movies like showcase, Cinemax, basically called after dark., I can’t get this film out of my head.

I read your description a few times and think I might know. I'm going to search some imdb clues then come back.

Good old Skinamax! Soft core porn for the masses. Sorry for posting I have no idea what your film is. I preferred my soft core porn with a horror angle.

Sounds great can’t wait for the response

Did you ever figure out what it was just wondering