It is matching society, however: CollegeBoard testing statistics reveal that in high school girls take AP Computer Science much less frequently than boys - at proportions fairly close to 1:3.

Given that anyone is free to take an AP exam provided they can spend $100, the only plausible explanation is that fewer girls choose to pursue computer science as a major.

Alternatively, you could suggest that there is nationwide collusion between CollegeBoard and amongst computer science teachers to limit girls from taking the APCS test - and that no one has found out or exposed it.