I always assumed that the longer your face was wet before you shaved, the softer the facial hair was....thus a smoother, easier shave.
As far as facial oils go, I never thought of that improving the shave. I have dry skin though, so maybe that's why I get a better shave after washing my face?:shrug:
hmm, maybe somebody should make this a poll? My curiosity is getting piqued. :hmmm: