You’re gonna take a girl home and fuck her in the ass and then get mad when you find poop?? This is an occupational risk of ass fucking. Do you not have access to a shower and washing machine?
I wouldn't mind a washer machine for people. Circular cylinder with jets on all sides that spray soap and water like a car wash. I'm sure it wouldn't do as well scrubbing but when you need a quick 2 min shower and have had a long day.. sure would beat trying to reach the middle of my back. Stupid stick loofa...
Researchers have done sonograms of women before and after arousal, with them having used the restroom immediately at the start of the process to control for initial urine levels. The bladder of a squirter fills rapidly with liquid prior to squirting, significantly faster than it does in similar non-arousal conditions. When you pee, you never void all of the urine in the bladder, so there is definitely pee in squirt, but the urea content was significantly lower than in the pre-arousal urine. IIRC, the researchers determined that the added liquid is mostly just water.
So, squirt is pee, but if she's gone to the bathroom recently, it's very diluted pee.
There is a porn squirt and then there is a vaginal discharge when some of the "natural lubrication" shoots out due to muscle contractions when your lady orgasms.