Originally Posted by
Velo Vol
Because, among other reasons, when you nick shaving the shower will wash off the blood and by the time you've finished it will stop and you're good to go.
See, if you listened to me, you'd have a better skin regimen and you wouldn't have such troubles with nicks and whatnot. But, since you don't listen to anyone here, I won't bother telling you why, but a quick search should elucidate you.
Also: alum block.