"Again, why do you think that is?"
What about "they prefer different careers"?
Women and men just aren't the same. Few women love cold machines, anywhere in the world. Even in highly feminist cultures like Scandinavia, female engineers tend to be in the minority.
We can look to the arts as well. In literature, you have a fairly clear picture of women reading different stuff than men. Same with music. Taylor Swift really seems to speak to the female mind, much less to the male mind. In the metal scene, the situation is flipped.
These are mostly introverted activities (reading, listening to music) performed alone, and yet there is significant gender difference. The same is true about, uh, porn.