I think sometimes the girls that gave me ass liked it for the freaky novelty of it. The girl I'm doing now says she likes it occasionally, but she would like it more with a smaller girth. We tried and failed a few times, tried and succeeded once or twice, but she has never asked for it again. Last time we were fucking and the pussy got too sore, I said it's not going in your ass is it? She said no. She likes when I eat and play with her butt though.
To the op: a few girls actually like it, most girls don't. Some girls will enjoy you enjoying their ass. I think that sums it up. Like all the answers here, it depends.