It's an economy, just like trading money and goods, there are trades made in this sexual economy. Such as one can trade their good looks to a less handsome person, in exchange for wealth. Also some people do reasoning, like a good fisherman, who brings a good harvest, may be more desirable than someone who is wealthy right now. People make trades. When I married, my then wife was far more physically attractive than me, but I had already begun a career with a steady income.