I have a little over 7 inches with some girth. When i was married (to a woman), her perception was that it was large. If i wasn't careful, i'd hit her cervix and that would hurt her. At the same time, when she was having an orgasm or close, she'd beg for "big ones" (big motion). i learned how to do both with here, giving her the big motions while limiting the depth. She's the only woman i have experience with, but that was a lot over 31 years.
After divorcing, i've only been with Men as a total bottom. Psychologically i love it when a Man minimizes my penis in a matter of fact way. i'm never into purposeful meanness or bullies, but am deeply aroused by Men Who do not perceive me as having a 'cock.'
As someone who is a total receiver of "cock," who never uses his penis penetratively, penis size takes on a very full meaning. To me a "cock" is more internal than external. I.e., it is also the driving force, energy, need and want behind it. i've been bred by Men with 3 inch cocks that were much larger than some of the 8 inch cocks i have been with.
i'm not just fluffing up the discussion here, i'm being totally real and honest. If physical size were the only factor, i can get dildos that are bigger than any human possesses lol. But, the only time i use a dildo is when a Man is using it on me, which is when the size of His internal cock really shows (or doesn't) itself.
To me, "cock" is the drive/need/desire/energy to penetrate, fuck, orgasm, breed, possess (to name a few), and physical size cannot substitute or cover for a lack of those things... nor by the same measurement does physical size detract from that.
i have been with Men/Tops Who saw me, understood me and/or were just being Their natural Self, and treated and spoke to me as having no cock at all. They were not trying to be mean, or play some role. Those are some of the most powerful connections i have had. i did feel "small penis humiliation" of a sort, i think that is in part a conditioned response. But was also deeply aroused and possessed because it was also deeply affirming... to both of us.