As promised to foxxcub here are recs for two super hot very smutty POTC fics. (Actually, the only two I've ever read!)
Vicarious by tessabeth Will/Jack. Non-con or at least coercion
Rain by hija_paloma and linaelyn Smokin' hot Jack/Will/Elizabeth PWP.
And if you haven't read kho's Lost/POTC crossover with Sawyer stumbling across a very randy Jack Sparrow, go read now! Sadly, no smut. (pouts)