Different girls like different things from time to time. In terms of
appearance, I think women do like the looks of a bigger dong. That is why cultures where everybody was walking around naked until recently have on average a tad larger penises than where they were covered for a few thousand years, or longer because of the cold. In places where people were walking around naked, it was easier for women to pick who they wanted to mate with based solely on penis size. In places where things were covered up, and maybe you would not know until you were already aroused, things like engineering prowess grew.
In terms of a fling, a random sexual encounter, if you pull out a huge dong it will probably be harder for the women to say 'no thanks' than if you pull out a 3 incher. Just the facts.
I'm pretty different, I had wang problems as a teen because I wasn't circumcised and nobody every told me how to take care of myself. So I did things wrong and my stuff grew too tight and it was a cause of great problems to me. I also could not really get fully erect, like ever. So even 17-18 years after getting circumcised I STILL rarely RARELY get fully erect. When I do. It's like a little smaller than average porn dong. Pretty good. But I usually hover at 75%, and it probably puts me just over average. But they tell me it's 'pretty'