This is going to get bad, I think. Think about it the next time you see some fellow walking out of the bathroom without washing his hands.
Most of the virus/bacteria exchange comes from mucus on the hands that then touch doorknobs. While somewhat repulsive, not washing your hands after you handle yourself is fairly germ free. Think about it. You are clean and there are no sources of bodily fluids other than urine which is sterile. You are actually much better off washing your hands after you leave the bathroom.