searching for specific movie

[jenny]

I am searching for a vintage porn movie dont remember title but i remember a scene in which it was a young couple having sex in a old "cabin" or something like that in the woods an old guy (grey hair with mustache ) broke into then beat the guy and the girl got fucked in order to save her man. It is an old movie i do not have high expectations thanks for your time and suggestions if found link or title of that porn.