What about things like kegels/squeezing?
Mouths are probably pretty different right? More tongue movement, unless you are facefucking.
If you’ve ever participated in something like a train - can you feel the difference between a vagina that has already been fucked?
I can tell the difference. Ass feels tighter and makzs me cum quicker.
I’ll sometimes use a big(ger thn me) dildo on my wife, and if I fuck her after I can feel how much the toy stretched her out.