Nicole isn't going to be doing IR. Look at twitter her account Aug 6 2011. She makes a very blunt statement on the reason why. The girl has a good heart and I totally believes what she said afterwards.
Her family doesn't want her to shoot IR porn. She called them ***necks.
So......her family is fine with her having sex with any White, Asian, or Latino guy on camera for the entire world to see where it will last forever, but to do a scene with a Black guy is a bridge too far? Well that's certainly one of the more creative lies I've ever heard.
My guess is she doesn't want to do it herself and uses that as an excuse.