What do women felt when having anal?

I occasionally have anal with my wife and she seems to be very engaging while we're having it. I did ask how does she feel after it but she never told me that she likes it or enjoy it, just that it felt different from vaginal sex. Just want to get some perspective here, how does it really felt to be penetrated anally as women to see if my wife really enjoys it. I don't want her to feel like doing something she's doesn't enjoy just because i like it