If natural selection was what was doing it, wouldn't you have a couple of thousand kids by now? :D
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And wouldn't we have tons more members here (no pun intended) Who knows, maybe people only see the bigger ones, because it seems a lot of people who are above average have less inhibitions about showing it off, therefore there would be more opportunities to see the bigger ones, making people think the average now is what used to be above average. Theres really no sure-fire way to know whether the average has gotten bigger unless everyone walks around naked with a hard-on.