Just a thought from someone who used to do janitorial work, and now works in the medical field!
There may be waste in the urine that will get your cycle started, but urine is also full of salt and protein that stain tile, and depending on your body chemistry and whether or not you are getting ill, could be full of sugars, blood, bacteria, etc....and then yes, there is also the smell!
It is quite possible it might work well, but I wouldn't recommend it! hehe!
38 Gallon (Freshwater): 1 Green Swordtail, 3 Yo-Yo Loaches, 1 Clown Pleco, 1 Blue Gourami, 4 Otocinclus, 7 Cherry Barbs.
46 Gallon (Saltwater): 60 pounds Lalo Live Rock, 60 pounds aragonite sand, 1 Coral Beauty Angelfish, 1 Peppermint Shrimp, 1 Mushroom Coral, 1 Emerald Crab, various snails and hermit crabs.
10 Gallon (Saltwater quarantine):