There was an American TV show called "Moonlighting" in the 80s--it starred Cybill Shepherd and Bruce Willis. It was a detective show, but the drama was mainly about the sexual tension between the two stars. They got together fairly early in the run of the show, which killed the show's chemistry. Since then, it's constantly used as an example in American TV as to why you can't have the show's two leads get together before the end of the show, lest you kill the chemistry.