Also the way you shave the area affects how irritated it gets. Follow what Indy said, make sure you use the fewest passes with the razor as possible, don't go over it a bunch of times if possible. Try to "stretch" the skin out a little, make it as flat as possible, and make slow passes with the razor. Also try different directions, shaving with the grain is always the best, but sometimes you may find something more comfortable for your skin.