Required by who? The NCAA doesn't enforce T9, it is the lawsuits from individuals that are the problem.
Title 9 is the best thing to ever happen for women sports and the worse for men's athletics.
Nothing like a statue stating that women athletics funding should be portional to the numbers enrolled. Not taken in account the financial aspects, or market. The only two sports that have any hopes of generating a profit at most institutions are football and men's basketball.
Of course because football has so many scholarships, it creates an enormous problem trying to balance women and men athletes. Instead of increasing women ships, the overwhelming tactic has been to cut men's sports.
I wonder why noone has ever challenged the NCAA on the basis of equality for men athletes in sports other than football and basketball. Even MBB has less ships than WBB.