What Arden said. You'll go through periods in which your hands are just super raw and you'll just hate touching the bar. This is a good time to use straps. Get some cornhuskers lotion and use it all day long.
I think this probably varies quite a bit among athletes depending on hand size and strength. I have relatively small hands, and as I get up to heavier weights, I have to grip the living shit out of the bar or it slips at the end of my second pull/beginning of third. This also helps me stay connected tightly during that transition - I think a lot of people get loose here - almost throw the bar up and catch it, rather than staying connected and really changing directions immediately and fluidly.