It was a movie with man and woman, both in police or some other profession which involved danger. And there was a tension between those two. There was some scene where they were in the room, trying to impress the other with battle scars. It ended them being naked. What was the name of the movie/serial? Wasn't it Dempsey and Makepeace?
That sounds very much like a scene (YouTube clip) from Lethal Weapon 3 in which Riggs (Mel Gibson) and Cole (Rene Russo) show off their various knife, bullet and auto accident wounds. There's definitely some sexual tension: "Yours is bigger than mine? I don't think so!"