Great definition for YM

From an excerpt from "eternity" by Michael Hanlon:
The Cambridge neuroscientist Simon Baron-Cohen (Sasha's father?) has described a new form of what biologists call assortive mating taking place in humans, namely that bright, successful men are choosing bright, successful women to be their partners. The alpha male no longer wants a dumb blonde; he wants an alpha female on his arm, someone attractive, certainly, but also educated at least to his level...
... this may be leading to problems. One such could be the rise in autism seen in so many countries in the last 30 years. This condition can be characterised by a sense of 'extreme male-brain-ness'. He believes that people characterised as 'autistic spectrum' are, in effect, hypermales, extreme systemisers, who in milder variants are good at lists, fact-checking, seeing linear relationships and putting the Universe into boxes.