David26 saidRecently I kinda debated if I was fucking a mouth or an ass. I am a virgin still ( I know sad...but waiting for right guy) Let me know if it's clear difference between fucking an ass vs a mouth....!! I wish I could pay more attention...but I was on poppers....so was zoned out a little bit for few seconds...
Well mouths tend to have tongues and most guys can't help but to keep their tongue moving.
Another aspect, mouths tend to get wetter as the fucking progresses while asses tend to get drier. While the anus does produce some minor lube (mucous which assists in passing fecal matter), the mouth salivates, and if you are fucking the face changes are high he won't have time to swallow as his mouth produces saliva.
AND if he still has a gag reflex of any sort, each time you drove it home it would have lead to more saliva production as having a larger object shoved down the throat tends to cause humans to produce more saliva in an attempt to swallow the impossible.
Since you use the work fucking, I assume you meant you were actually thrusting and pistoning in and out of a hole. Few guys can take a face fucking without begging off (yeah their pussies), so if this was a prolonged hip thrusting fucking on your behalf and it was sustained for a few minutes, chances are rather high you were fucking ass and not a throat.
Throat fucking works best if the the guy is on his back with his head tilted back a little to allow his mouth an throat to align for easy of deep penetrating. This is not something readily accomplished being on ones knees.