Hey man, i have a lot of good friends in the world and a few of my best ones are girls. One thing were open about to each other on any level is relationships, because hearing the others opinion without genre bias can be helpful. "uhh sean why hasn't my bf been calling or wanting to do anything all weekend, is he pushing from me?'. No, he plays xbox, Halo Reach just came out. Just interpreting situations differently.
Anyway, they have dated guys and we got into topic of dick size, they've had bigger/smaller guys etc.. I asked if there was a difference, they said yes in size you can feel it but it depends on how good they use it, they've climaxed for often with smaller guys just because they put more emphasis on it!. So why does this age old saying matter, well I heard it straight from a first hand source and not some random chick on the internet.