Marketplace economics like those done in the paper don't apply well when both parties are buyers. They also rest on concepts of resource scarcity, which is an

Marketplace economics like those done in the paper don't apply well when both parties are buyers. They also rest on concepts of resource scarcity, which is an artificial construct in the context of post birth control sex. Artificial scarcity rarely lasts long in markets, it can only be propped up by industry collusion. The 50's model of "precious chastity" sexual relations just doesn't apply to current interpersonal dynamics. The risk factors that drove that model are very different today and have freed both women and men in different ways.