Womens' appearance is mostly driven by what other women dictate, so suggesting women respond to something their husbands desires is such a radical break from their way they live their life that they can't emotionally handle the thought.

When men want women to care about what they think, they go to a prostitute, real or imagined. The author is pleading for us to stop sending our men to prostitutes, basically, because large swathes of men are deciding they prefer prostitutes and it's going to cause us to go instinct.