I saw this film in Germany when it came out as I was living there at the time. It was one of the funniest films I ever saw. Some years later I got a subtitled copy back in England and was shocked at how unfunny it was when translated. Which goes to show that humour often only works in the language it was created in.
That said, it is still a very unstylised view of culture clashes and a study of how far people are prepared to go when they aren't getting any sex. No one gets what they want by the end: the gay man doesn't get his straight friend; the straight man doesn't get his free-love lifestyle; the straight woman doesn't get her angry singledom.
I guess the moral is that you can take the human out of their sexuality, but you can't take the sexuality out of the human. Trite, but it reflects the title of the film, referring to a proverbial fish out of water.
