I think it would be rare when a relationship has "equally attractive" people. There aren't too many Brad Pitt/Angelina Jolie couples running around.
Traditionally men place more emphasis on getting the most attractive woman they can find and women placed more emphasis on getting the most financially stable man they could find.
Therefore you see lots of young men buying and reading "get rich quick books" and attending wealth seminars while young women are focused on diets, fashion, cosmetic surgery, and various cream/lotions that promise to hide "perceived flaws".
Generally speaking in the majority of relationships women are more attractive then their men. (That's fairly normal)
Attractiveness may be an issue in relationships when men are more attractive then their mates.