The American importers of I Am Curious (Yellow) triggered what probably should have been the Supreme Court case that should have changed US Obscenity laws, but totally didn't. Turns out the Supreme Court didn't find Vilgot Sjöman's 1967 film to be obscene anyway. Fortunately, the controversy made it a very popular film. Unfortunately, the expectations of a barely-legal porno that was actually a weird meta political treatise meant that when I Am Curious (Blue) made it stateside the next year no one was going to be fooled into seeing it again.
They missed out. (Blue) may not be more interesting than (Yellow), but it's at least just as good. And I think they're both delightful. We talk about them on this week's Lost in Criterion.