Providing sexual services in exchange for money is illegal in many parts of the world, “oldest profession” or not. And where prostitution is legal, it is often not regulated, leading to a whole new set of problems. On the other hand, being a long-term, extramarital lover may be frowned upon, but it’s generally not illegal. Sociologist and sex researcher Li Yinhe argues (as reported by the online edition of the South China Morning Post) that if mistresses and prostitutes are in the “same supply-chain”—that is, they essentially provide the same service—then prostitution should be decriminalized. In her talk at a “Love and Culture” forum, Li went on to discuss modern marriage, which she also sees in socio-economic terms:

…[T]he sociology professor said that judging from its current form, [marriage] would soon break away from its “shackles” and become more “free”… “The reason we had marriage was [traditionally] to bear children and allow each generation to inherit private property,” she said.

“If there are other uses for property and less cohabiting couples raising children, then the institution of marriage is likely to become extinct,” she added.