This post obviously isn't intended to lay the issue of dysgenics at the feet of Gary Gygax, who after all, had six children. I chose the title simply because Dungeons & Dragons and similar games which are always associated in the popular imagination with same was such a cultural force for those growing up north of the second sigma back in the early 1980s.
Among the smart people who I knew and shared social circles with growing up, in one respect I seem to be a fairly significant outlier. Most of this group has passed 40 now, so it is appropriate to take stock as opposed to simply saying 'let's wait and see'.
That respect is that I have children. Two presently, three with fairly high probability, and four is probably at more than 10-20% probability. Of most of the rest of the people that I knew growing up and in college that are beyond the Second Sigma, very few have children, especially the women.
This isn't to say that all of those that I know who are beyond the Second Sigma are barren---indeed the engineers I know from work and several other reactionary bloggers in similar orbits actually have fairly sizable families, often exceeding that of my own.
I'm scratching my head right now---trying to think of anyone I know who is beyond the Second Sigma, has children, and isn't a fairly hardcore religionist. I know a fair number of very smart atheists, both of the high and low church varieties, but I've not seen any issue from them, so to speak. I'm not used to effects frankly that seem THIS binary in nature, not when we're talking about real people and not figures and lasagnas etched and baked into silicon.
Anyone care to take a crack at an overarching theory explaining these observations, or to add more data points?