To add to Jason's point about about the "plain" lead girls having to have red hair in this era, and the hot girls being blonde, Haviland Morris who played Jake Ryan's hot blonde girlfriend in Sixteen Candles has red hair in real life, and so had to wear a blonde wig in the movie. You can see her as a redhead in the cinematic gem Gremlins 2. Sorry if it's been mentioned, but wasn't Brad also the boyfriend in Cool as Ice??