uke: WHOOOOAAAAATTTT??? Who's ass has "juice" in it?
(No offense to anyone)
It's just liquid. No one's rectum isn't completely dry, otherwise you'd have a hard time having a BM....there is some amount of rectal fluid (ass juice), that helps to keep everything "soft" and "lubricated".
I experience the same thing after anal sex. I play safe so I know that it is not my partner's cum. Sometimes it is thicker than other times. I had one lover who did not like to use lube but what do you know? We didn't need any after the initial insertion. I assume that it also acts as a lubricant.
Sorry, but there is no such thing as ass "juice". Your RECTUM does not produce any of its own fluids; what little fluid that is exchanged is absorbed via osmosis/simple mucous membranes.
If you have ass "juice", it's probably just sweat and oil from the external anal area (which produces a lot of that). Or maybe you squeezed the juice out of a turd you were storing while you were cumming.
Seriously, you descending COLON produces minimal amounts of mucousy discharge, and does it fairly efficiently, but mostly manages the amount of fluid already present in feces. Your colon is... located a ways away from your anus.
I learn something new every time I log on here....