Urine is quite clean. Most of us today find the thought of touching it a bit off-putting, but that's for cultural reasons and because of other stuff that goes on in locations where we typically urinate. Eskimos used it to wash their hands. For centuries doctors would taste their patients' urine as a diagnostic tool; we have better methods of diagnosis now, but it didn't make them sick. Pediatricians get sprayed with the stuff all the time when they examine infant boys and forget momentarily to hold things down. (My older son treated his pediatrician that way about 45 years ago. No long-term effects on either.) Maybe we should worry about some fluids we might come in contact with, but urine? No big deal.