I read a long time ago that big cocks are not just cosmetically different but also evolved to have the ability to displace (or 'scrape out') semen from vaginas and replace it with their own more easily than smaller cocks through their ability to reach and thrust deeper within.
Kind of mostly irrelevant to modern day dating, but it's just another wrinkle to this discussion I think. Although I think that's also to do with the glans size and shape. Nonetheless, at some point anyway, it seems that big cocks were not just nice to look at but had an evolutionary purpose
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