A bit weird.
This past weekend I was 69-ing my girl. I was really going at it and all of sudden my mouth got a little wetter and tastes of coffee. I had to stop and I ruined the moment for her but I couldn't contain my disgust at the time. I believe she peed a squirt in me without realizing it, because she is a coffee drinker and I'm not so this taste was from me. I suppose it's possible, right?