I wouldn't have to be forced (though I've nothing against a bit of rough play), Rupert Grint would be high on my list.
Jessica Alba could squat over my mouth all day and all night...even if she farted it would feel like pure oxygen to me.......
If forced, huh? There are many women I'd enjoy tonguing the bung but if forced than I'd try and take advantage of the situation...and so... ...I'd rim ole Queen Elizabeth!! Get myself knighted and titled!! I can see it now... Sir Zen Coyote H.R.R. (her royal rimmer) Earl of Buttmunch Zen