I always shave after I shower, and I put on my with cotton bathrobe. Keeps me warm for my cold water shaves!
I tried doing the towel and slipper thing because I shave mostly with straights. It doesn't happen most days. I have only dropped a razor once, and I landed about six feet away from it. I'll risk it.
I'm not worried about dropping a straight on my nether regions, they're well protected. Here's a visual aid. See? Even naked I wouldn't be able to do any damage.