It's not about putting it in and ram her ass as hard as possible so in the end she squirts all over you. That's only in the movies... (A very few percentage of women like it like that, but it's maybe 5% of women who do anal)
Yes it is possible. I used to have a girlfriend that had anal orgasms. But not every woman "can do it". Key is for her to be absolutely relaxed and she can let herself go completely. There are lots of nerves inside and around her anus and it's very sensitive. There is a thin line between pain and pleasure. That's why most women don't want anal, because of bad experiences in the past. As a guy, you have to know what you're doing and listen to her