there was a study recently i ran across about anal sex and some of the good and bad about it, one thing that it was very up front on was women whom experienced anal sex at-least once a week stated the feel fuller and deeper orgasms by like 60% i think if i remember correctly and women whom experienced it more often then this reached more powerful orgasms more regularly, which any women will admit the strong the orgasm given the more connected she may feel to said person.
i personally have never push my partners to anal though many do like it we do not incorporate it into the act it is lengthy enough now.