sell the bathwater

Women who forge lucrative friendships with men who are attracted to them are "selling the bathwater."

They are able to put in low effort to maintain friendships with men, only to have the men worship them in return.

Origin: Belle Delphine was able to sell her bathwater online for $50.

Dan: Wow, is Steven really doing Stephanie's homework again?
Luis: Yeah man, Stephanie really knows how to sell the bathwater.