Hey, it's just a goofy, silly, sweet 1970's porn. It's got ridiculous stuff like badly dubbed maniacal laughter while three people are standing in a room and none of them are laughing. That said, the movie seems fairly in on the joke itself- it's pretty goofball and was intended to come across as such to then current audiences. The whole thing is your basic flimsy porn story line premise with pretty tame and vanilla (though fully explicit) sex scenes.
I will mention that I take issue with the other reviewer panning the looks of the actress, she's fine and if anything it's the male lead who (at least by modern standards)is kind of goofy looking, but at the same time, who cares? It is what it is.
Despite the poster, there is very little femdom, but it does come up as a gag where a Russian interrogator is into being whipped, so he has the women he interrogates tie him up and beat him. This is a throwaway joke about 2/3 of the way through the movie and is revisited again towards the end.
On the whole, personally, the movie poster was by far my favorite part of the movie, but the movie itself is a silly and sweat slice of American sexual history. It is what it is, and it's currently available for free on Xhamster (which to be clear is a porn site and has all the risks of watching anything on a porn site, though they're pretty mainstream).