IF My husband of nine years tells me he does not lust after other women and every tv show he loves has women with big butts am I wrong for thinking he gets turned on watching these shows?

Yes, he just might very well enjoy the show for it's theme. If he's watching this in front of you that would mean he feels comfortable watching this with nothing to hide and he enjoys your company while doing so. I'm no Dr. Phill but that's my take.