The Beast, 1975 - ★★★½
Ok, let's get this out of the way first. Yes, there's horse dick in this movie. Lots and lots of it. So if you have a problem with horse dick, this is not the movie for you.
As a movie, it's OK. It gets a 7 out of 10. The story is not revolutionary, and the effects didn't exactly age well. Still, I found that it was well performed. It tells the familiar story (all men are sexual beasts) but it turns it around, with women beating men in their own game.
This is an erotic movie from the 70s which you won't find on any streaming services today. The question to ask yourself is not if you're OK with the sort of taboo the movie shows, but why you no longer have the option to wonder about this.