Some neat statistical analysis and visualization here about jobs that, from 1950 to 2015, remain predominantly one gender, are evenly split, or have substantially changed.
There are few (good) reasons for such divisions; most seem to be cultural. Still, it’s a remarkably different world than at the beginning of the period, where most such differences were seen not just “how things are,” but actively dictated by God and/or Nature. There seems to be less of that sort of attitude today (at least in the circles I circle in), if still a certain, “Well, this is something we [gender] do, so why are you wanting to do it?” social snubbery.
It will be interesting to see how this continues to evolve.
Most Female and Male Occupations, Since 1950
The shifting majorities of the sexes in the workplace.