I'm definitely with you on this. My ex-husband used to say that there must be something demented about me because I enjoy it so much. Personally, I think that he was more than a bit demented for NOT enjoying that I enjoy it! And I give any male out there who agrees with me permission to go take his man card away immediately!
Honestly...it's a combination of all the things that have been mentioned....the fullness in my mouth and throat, the smell, the taste, the softness of that skin against my tongue, the noises that they make, feeling them tense and catch their breath. A few friends of mine don't like giving oral because they feel that it is a way for the man to control them. I don't see it at all that way. When you enjoy it as much as we do...and are not only great at it but KNOW that you are.....YOU are in control.
It never fails to flip a guy out the first time they realize that I've come to orgasm simply by going down on them. I love to do it. They love to receive it. Win, win.