Her character's marriage in the film Boogie Nights gets married, and Nicole, at the time, was not as seasoned an actor as she is today. I believe Anderson prefered to explore other characters more (such as the turbulent Durk Diggler and the submissive Buck Swope). Did you also notice the Nina Hartley character wasn't developed as much? This was the producers decission. I was on that set and can tell you everything that transpired.

I still get shivers when I watch the scene when Becky says "Sexual Chocolate. Oh come-on Buck you don't have to lash off like that." Her lips and chocolate skin.. her eyes... it's dreams.