The "Don Quixote" story has be-deviled great filmmakers like Orson Welles and Terry Gilliam, so perhaps the makers of this deserve credit for simply finishing this movie and avoiding the fabled "Don Quixote curse". Of course, this is not exactly a faithful re-telling of the great 17th century Spanish novel (I've read the book twice and I don't recall either Don Quixote or his sidekick Sancho Panza getting anywhere near this much action). But this is also not just some cheap porno parody either. They actually spent some real time and money on this, especially on the famous windmill-fighting scene. This movie also continues the bizarre 70's trend of combining softcore (or sometimes hardcore) porn with half-ass musical numbers, putting it in the company of other porn musicals like "Alice in Wonderland", "Cinderella", "Fairy Tales" or the XXX "Blonde Ambition". Of course, the musical numbers are very low-rent and often pretty stupid, featuring goofball songs like a woman complaining that her partner has prematurely ejaculated or a number with Sancho Panza suggesting that two busty girls can have sex with him without winding up pregnant.
The actor playing Don Quixote is pretty miscast. He is much too young for the elderly, senile would-be knight. But at least he is half-way believable as the beneficiary of all this hot sex, unlike Hy Pike as Sancho Panza, who gets even more women than Quixote, despite looking like a cross between Ron Jeremy and Danny Devito without being nearly as attractive as either of them. (The actresses that had to feign willing sex with him probably deserve some kind of acting award--that or a Purple Heart). Still, Pike is at least a little more talented acting-wise than your usual male porno stiff. The actresses meanwhile include Haji from Rus Meyer's "Faster Pussycat, Kill ,Kill", the very cute Patrice Rohmer from "Revenge of the Cheerleaders" (she's pretty unrecognizable at first as a brunette serving wench ,but then she takes her clothes off--and, yep, it's her alright). There's also a couple of actresses like Maria Arnold and Sandy Carey, who appeared in any number of softcore and hardcore porn films of the era.
The director this Rafael (Ralph) Nussbaum is probably most famous for the Candice Rialson exploitation vehicle "Pets". This doesn't have Rialson, but otherwise it is probably the better film. It's not great, but it's pretty entertaining, which is all you can really ask for with a flick like this.