I sometimes suspect that some women want to think that their partner is 7" (or 8", or 10", or whatever) and that this is more important than his actually being 7", 8", or 10". In other words, it's exciting for them to think that they're with a hung guy, and his actual size is less of an issue (within reason). Sexual arousal is largely a mental/psychological thing, after all.
Obviously this doesn't apply to all women, but this could partially explain all the overestimating of penis sizes that goes on.
I wonder if sex is less satisfying for such women once they know his 'true' size? Gonna try that one out sometime. :evil: