For men looks have become much more important.
Environmental stresses have been decreased to almost nil in western countries, almost no one is in danger of going hungry, not having a place to live, not having security, not having access to medicine, not having some basic luxuries, or not having a good environment to raise kids.
Because of this, your ability to provide environmental benefits is much less important than your genetic profile. They were both always important, but in the past you could compensate for bad looks, more so than today, with intelligence, perseverance, good skills, status, wealth. As these things were much more important for a woman in order to successfully raise kids/have a good life.
Nowadays most women can look after food, shelter, basic luxuries and a good environment to raise kids themselves. Police provide security, government provides healthcare. So these are less important when choosing a mate.
There are also many other reasons which have been outlined already in this thread.