Also kind of unrelated but I experienced the same kind of "OH GOD!" in college....

So one Friday night and I was getting it on with some girl in the living room of my frat right outside the frat library. The library has a big solid wood conference-room type table in the middle with our frat letters and logo inlayed in the wood and no windows and a locking door. I always talked about how awesome it would be to fuck on the table, and no one had done it that currently lived in the house. The living room was a high traffic area so this girl and I went in the library and stripped down. The lights are off so it's pretty fucking dark in there and we're both having some trouble, mouths dry from cocaine and weed, I needed anything to lather things up a little bit... gallon jug of water, perfect. I bend this girl over the table and pour some on her ass and we go at it for a while standing up. After a little while I switched it up and we both climbed on the table. I had her in doggy when I noticed a funk. A smelly smell. Whatever, I thought, so she didn't take a shower today, no big deal. Then I went to take a swig of this jug of water and as I brought it up to my nose the smell got worse. A lot worse. OH GOD!

Rewind to earlier in the week, Tuesday night I think....

I was up late studying in my Frat's library. It was a pretty long walk to the bathroom and I drank like 2 gallons of water that day and did adderal so I was pissing every half hour. I didn't want to waste time walking back and forth to the bathroom so I pissed in gallon jug that had someone's chew spit in it. I left it there for the pledges to clean up, they were supposed to clean the library every Thursday. They didn't do it that week.

We still finished out having sex but the smell got progressively worse as the water started to dry, it was horrid by the end of it. I didn't say anything and neither did she. I'm pretty sure she just assumed that my balls smelled like old feta cheese and ammonia. Never heard from her again.