One of my favorite moments in all of King of the Hill is when Kahn is mad about Bobby and his daughter "dating," and he goes over and yells at Hank that his son is a "girl-crazy sex fiend." And then, after he leaves, Hank is walking through the garage, and suddenly stops, alone, and emits a little nervous laughter, and then a deep sigh of relief. And then the scene cuts.
No explanation is given because none is necessary.