Putting urine on a compost heap is a good idea, as the compost is often carbon-rich but nitrogen-poor. Urine is sterile when in the bladder, but tends to collect bacteria on the way out, if you get my drift, but most of those bacteria probably don't survive away from the moist warm surfaces of the body. Faeces is a different issue. They are full of E.coli and could pose problems when added to food plants. I suppose people used human faeces in former times but then, many of them had parasites, and a lot died young.

Some sewage farms do dry down the processed and sterilised sewage and sell the residue as fertiliser. I remember hearing about "Yorkshire Gold" a few years ago, which was exactly that. People who bought it complained that tomato plants grew everywhere the Yorkshire Gold had been. Hardy little buggers, tomato seeds. Pasteurising doesn't seem to touch them.