There are many approaches, but here's some general suggestions:
1. Obviously, the first suggestion is just a straightforward Q and A. Ask her if she likes it, or if not, what her objections are - it may just have been the types she's seen in the past.
2. Make it a game - over drinks or cards. For example, lose this round of poker, and you have to watch this with me, naked..
3. Surprise her. Start with something soft, and include it in a romantic night.