I want anal like she wants emotional security, constant validation and to have the keys to magic castle otherwise known as the right to offer sex - the same act she will invariably use as a weapon to cajole me into conforming to her every viewpoint.
As far as I'm concerned, anal is an act of intimacy. I like to push my partner and I like to be with partners who like to be pushed - if you give your ass, you're making a sacrifice (and it's for me). If you let me take control in bed, and give yourself to me, it demonstrates trust - it's something you wouldn't ordinarily give but you want to give because it's me, and you deem me to be special.
It's why BDSM is so appealing - to sacrifice control is one of the greatest expressions of trust you can give.
...for the 2nd time this year