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Well do you have an answer? To me it seems highly unlikely that all the women have been turned away by sexism. I remember the times when programming and computers where considered extremely unsexy and basically made you an outcast and unlikely to get a girl-friend. Computer kids back then would have been very happy to meet a girl who was interested in computer stuff.
The worst of the sexism comes from other girls. Nerdy boys largely get ignored by their non-nerdy peers. There's an attitude of "I don't know why anybody would like that, but whatever". On the other hand, nerdy girls are treated like absolute shit by other girls. Instead of "not my cup of tea", it's more like "eww, that's disgusting, and you're disgusting for liking it". The movie Mean Girls could have been a documen…
Mean Girls was actually based on a book on helping your teenage daughter survive bullying in school ( https://en.wikipedia.org/wiki/Queen_Bees_and_Wannabes )...