Convincing your girlfriend to do anal

Now, she's never tried it, but insists she finds it disgusting. How can I change her opinion guys? any ideas?

Do anal on yourself in front of her to see if it impresses her. Be sure to have a big smile as you do it so she thinks you're really enjoying it. Peer pressure could be good here, so get her to invite some of her friends along to watch you and say what they think. After they  leave don't even try and look for a new girlfriend. Word will get around. Instead get used to a long and lonely life: just you, porn and 4chan.