How about the French animated classic La Honte de la Jungle? Moving. Truly moving. The most memorable sequence for me is when the chimpanzee starts to masturbate whilst watching the female lead take a shower. The ensuing denouement truly takes one's breath away.
RE: Remember it well. It's an adapted stage play It is indeed - David Mahmet (sp?). I've seen it so many times I can pretty much recite it from start to finish. Like it more every time I see it.