As clay6 mentioned above, from what I've read on this subject is that for the most part it''s safe as long as their are no infections, virus's etc. that can be passed on. The key to this intimate practice is to be well hydrated and have peed a couple of times before consuming. One thing to mention is that any meds or vitamins can be passed on as well so be well aware this if the person is on say, heart medications etc. The kidney acts as a regulator meaning it grabs things that the body doesn't require at any given time so even good things like vitamins, nutrients etc. can be passed on too.