I love doing it to a woman. I'm too self conscious to let someone rim me. I'd just be too paranoid that I wouldn't be clean. I know I would be clean as I'd make sure I was before hand but it's a mental block that I have!
It is my wife's speciality. The reaction from guys when this gorgeous classy blond runs her tongue down their cock, to their balls and then into their ass is amazing. Lol