You should consider revising your opinions and not making unwarranted assumptions. Or at the very least being open to the idea that it is because they are in fact not (statistically) equal in innate ability at the sport. It is certainly, prima facie, the obvious conclusion to reach.

Yes there are other factors such as the massively overburdened 'lack of role model' explanation, but these are better explained as positive feedback from an already unequal situation (and in any case does it matter so much if you can have separate men and women sides to the sport?).

The world is a very confusing and complicated place if you don't accept clear evidence however inconvenient!