>>1175619...That's not possible either. The urethra leads to the bladder and then the kidneys through tubes that get progressively smaller. In the kidneys it's nothin but blood vessels, loops of Henle and all that other good stuff I forgot from high school AP Biology. No way you're getting ANYTHING through those (aside from blood and minerals), and even if you did you'd just end up in the blood stream, which is in no way an easy path to the mouth.
Yeah. Just forget it. The ass is your best bet, and even that's pretty much fucking impossible.