Educated women were the gatekeepers, the guardians of eugenic marriages, though fecund poor women continued to outbreed their female betters. So-called experts contended that those who overindulged in sexual activity and lacked intellectual restraint were more likely to have feeble children. (Here they were imagining poor whites fornicating in the bushes.)
That's not how that works at all, even assuming Darwinism could be applied to modern humans in ways that we would be able to see in a few generations, which it can't.
