That's called 5k years of patriarchy, where women who make the first move are widely viewed as too aggressive to be considered attractive. It's also a function of rape culture, where assertive women may be seen to be "asking for it" and potentially put their safety in jeopardy. 80% of rapes are date rapes.

If you want a world where women initiate half of all dating connections, you've got to first rectify those other parts.