This topic has me writting my first post ever............
It's all relative.
My current gf has had 40+ partners and has had, from what I can gather from what she describes, at least 4 guys that were in her words huge.
I'm 7.5x 5.something and she's described me as "average".
So in her experience she does not consider me big at all. That being said, before the topic ever came up she's said I'd made her orgasm more than any other and in more variety of positions. (Previous to me she's had to be on top to climax). She's also said it's the best sex she's ever had and she's never had multiple orgasms prior to me. These comments came out of her unsolicited and after she came hard a couple times so I have no reason not to believe her.
She may have her perspective of what big or huge tempered by her history but it doesn't seem to matter in the big scheme of things.
Now prior to her I've had comments like "I can feel you so deep inside me" , "I love your cock", "nice penis" and "would you like me to suck on your big penis" by previous lovers.
None of the sort from my current one though b/c clearly to her I'm simply not that big. It appears from what she describes as she's had as big as 8.5x6 or possibly 8.5x7.
So I'm just not that big to her, however I suppose there's more to great sex than a bigger rod. Or maybe she's a closet size queen. I doubt I'll ever know. It does bother me to some degree that she thinks this way as I'm not 'average' as all the studies seem to indicate. But as she says the proof is in the puddling and she references the results of our great sex life and her tendency to orgasm more often with me.
Although our culture tends to indicate differently with respect to popular media, movies, shows, porn and the like, I'm beginning to believe that guys are much more into their dick size than chicks.