High intelligence is not necessary to survive and reproduce successfully even in today's world which explains why most women (and probably most - but less men) would rather be "hot" than "smart". In general, during the reproductive phase of their lives (and long after that as well), women focus advertising their reproductive health, and men - their status.
High intelligence however is key to acquiring status - which is much more important for men than for women which in my mind explains why more men than women are interested in being smart.