> The other alternative would be to say that men in the field had established mechanisms which were astonishingly effective at keeping them out even though they really were interested, and which still stood today.
Many women who currently participate in FOSS claim that yes, this is exactly the case.
That may or may not be correct, but I am a bit astonished that you can dismiss the possibility as ridiculous, unworthy of consideration. Have you ever *talked* to women? Do you care what they say?
I'll also point out that your argument -- that women almost never do <whatever>, therefore they must not be interested -- has an extraordinarily poor track record. Within the last 70ish years, people have made that argument about essentially every field of human endeavor, and in every case it has either turned out to be wrong, or the jury is still out. (With FOSS in the latter category.)