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Fresh urine is sterile. It's a good breeding ground though, so it rapidly becomes less sterile.

> Fresh urine is sterile. It's a good breeding ground though, so it rapidly becomes less sterile.

Could you explain this a little for the biological layman?

There be no animals in urine from start.

But animals like urine, because urine tasty. So many animals come to urine ASAP!

It's sterile when it comes out of you. However, once it's out of you, and sitting there in a puddle, it is very easy for bacteria to grow in it.

I think this would qualify as one of these: https://news.ycombinator.com/item?id=6000815

Urine in your bladder is sterile. It passes through your urethra on the way out, which is definitely not sterile.

I think automotive grease is roughly sterile as well, but I don't want to have it smeared all over my hands all the time. There are extremely practical reasons to not want urine on your hands other than the transmission of bacteria. And not illogical, either -- the smell is not pleasant, and it would certainly be a social impediment.