Bit late to chip in here...but I am a nurse and had a stint on a urology ward.
Normal urine is sterile (if you are healthy)
Sterile means contains no bacteria.
BUT, it can be contaminated by bacteria on the way out.
If you have an infection in your urine it's not likely to come from your bloodstream it'll have come from your poo! Most common urinary tract infections (UTI's) are from e-coli and are caught by not wiping from front to back when you go for a wee, the bugs grow around your urethra the bugs multiply making it burn when you wee etc...
Now, drinking urine. Personally, I wouldn't wanna do it would like to wee on someone but that's another matter Definitely no drinky drinky for me! It won't do you any harm if it's healthy urine and you'll usually be able to tell cos it'll taste and smell YUCK if the person has an infection. Say if you have a penicillin allergy I wouldn't risk drinking a person who is on a/b's urine cos tiny amounts are excreted through the urine.
You'd probably run more risk of catching something from rimming if the person has e-coli in their gut. You'd get a very bad bout of vomiting and the shits. Nice!
Happy drinking you lot