I believe that women who have had larger than average (6.5 to 7.25) and/or BIG (7.25 (or so) and above) will tend to underestimate subsequent cocks she sees (unless its truly a monster (7.8X5.8 or better). I think first impressions (not only the first cock a girl sees (but also your attidude and confidence about your own cock)) affects how she thinks and percieves your cock and others’ cocks.
Example1:
1st guy’s cock she sees = actually average size (but hes embarrased about the size).
Cocks after his that are bigger than his, same size OR slightly smaller, but more confident guy attached to said cock will seem bigger to her.
Example2:
1st guy’s cock she sees = 7.5 X 5.7 (big) (guy is confident)
Cocks after his, even slightly bigger ones (i would venture to say even as big as 8X6 would either seem smaller than 1st cock (therefore “small” according to her) or would seem about the same size as the first cock
Example 2 is foiled though, if bigger cocks have just as confident guys attached to them as the first guy.
My 2 cents….