I do it because I love it. I also want to give her pleasure but I enjoy it. I love the feel of my tongue on her raosebud and her getting hotter and moaning and shivering from the orgasm she gets. I miss that because I am not in a relationship now. edspecial_mail at yahoo
For me, I'm very lucky. My girlfriend loves receiving oral and enjoys being rimmed; she doesn't like doing it but it's not an issue as I go down on her more often. For the last 18 months of 2 years I've rimmed her every time I go down on her and neither of us can imagine me not doing it to her.
I've done it to lovers in the past and I guess they enjoyed it but it makes it more enjoyable knowing my girlfriend is expecting me to do it and looking forward to it now!