Not all programmers are men; I want to make that clear to all genders who can be programmers.
Historically without any facts I'd say that men have long been steered towards STEM related roles, whereas females have not. Purely as a long standing historical change in roles for Women vs roles for Men, there have been traditional roles for females vs males, however this is shifting.
There are so many reasons for this that I'm probably not best to talk to it. The important thing is that these things are changing to provide more choice.
eg: Steve Shirley
In the 1950s, she worked at the Post Office Research Station at Dollis Hill, building computers from scratch and writing code in machine language. She took evening classes for six years to obtain an honours degree in mathematics. In 1959, she moved to CDL Ltd, designers of the ICT 1301 computer.
After her marriage to physicist Derek Shirley in 1959, Shirley founded the software company Freelance Programmers with a capital of £6. Having experienced sexism in her workplace, "being fondled, being pushed against the wall", she wanted to create job opportunities for women with dependents, and predominantly employed women, with only three male programmers in the first 300 staff, until the Sex Discrimination Act 1975 made that practice illegal.
Then computers became cheap enough for families to buy them for their sons (and less often their daughters).
long term expectation: Engineering, finance is majority male. Doctors, lawyers are majority female.
Increased gender equality skews this harder.
good? bad? idk. least both genders have high ROI career paths.