She was hired in the 70s (and continued doing consulting through the 90s) by a designer of nuclear reactors doing programming, since she could understand both the engineering side (steam valves etc) and the programming side - she helped program the nuclear reactor control room simulator using Fortran.
Yet now she is a professor at a well-known university. The hours are easier, pay is as good or better, excellent benefits.
Given that, why beg women to join in something that doesn't pay as well and expects you to slave away during weekends and holidays when there is a crunch?
(edited to add: I think part of it may be that men (speaking generally) are more in love with the works of their hands, even if it doesn't benefit them directly; they can have pride in it years later. I am not sure that women necessarily have the same attitude towards material objects.)