This movie is perhaps the only example of a legitimate screw-ball comedy that doubles as a porn film from the genre's golden age. The plot is simple and unimaginative. An English aristocrat visits an estate to rest and do some work, but instead of calling in musicians for his entertainment, the owner accidentally calls prostitutes. What follows is a chaotic afternoon of everyone getting it on with everyone else.
The acting is better than expected, but nobody in the film is taking it too seriously. Clearly the intent is to make a more explicit version of the low-budget "B roll" sex comedies of the era, and even the performers are veterans of these mostly forgettable productions. It plays like a really naughty version of the Benny Hill Show.
Of note, most sex scenes draw on a common "no means yes" trope. We see the protagonist force himself/herself onto an unwilling target, only to see resistance fade once the action gets going. The same basic premise was a staple of future mainstream raunch-coms like "Porky's' and "Revenge of the Nerds." It is a reminder of how times have changed, and what we call rape, they called humor.
This is first and foremost a porn flick, and whereas the nudity leaves no legs unopened, the sex is softcore. It is also performed in a more comedic rather than erotic tone. Hardcore films were being made by this time, so why the producers decided not to cross that line is anyone's guess.
Aside from a handful of funny gags, this is not a good movie, and it is not even good porn. It is, however, a solid example of why adult films generally fail spectacularly when they attempt to cross the line into mainstream entertainment.