One of my GFs had smaller mouth, and a not so good jaw... she dislocated her jaw one time giving me a bj... made for an awkward ER visit late at night. In general the biggest complaints on my end is the teeth during BJs when they aren't paying attention.
Only been 1 case where i couldn't enter a girl cause she was too tight... (i later rectified the problem at a different date)
My current girl if we go without sex for a couple of days ..... i'm not sure if it's cause i get carried away and get a little bit extra rough, or if it's just cause she isn't as used to cock as much, but she often comments after she cleans up, that i made her bleed a little. It's not so much of a complaint, just a comment... i think she likes it though....
visually i like seeing girls with their hand around my cock and seeing that there fingers can't wrap around.
I've never had a girl complain about girth. But i've had 1 girl complain about the length (which i'm not that long)
And i think i read a one of the newer studies on size that was posted somewhere on this forum. Now that penis girth survey questions are now being added as options to the questionnaires that women get about penis sizes. I believe i read that more girls wished their partner had more girth, than girls who said they wished their partner was longer.