This is the kind of question that shows how little women understand men.
Porn is about looking at women who look better than their wives, girl friends, etc.
It's about looking at women who look *different* from their wives, girl friends, etc.
Men love *variety*. Pretty much in everything. That's the attraction of porn, and unless a wife/g-f has the power to totally shift her appearance (including hair, body, height, etc.) at will, no one woman will ever be able to offer her guy the *variety* that he wants to at least look at from time to time.
Women, it's this basic: Not everything we men so is about you. Get over yourselves.