when the classifieds sites like craigslist took the erotic section down, people just post ads in the for sale section, the jobs wanted section, the small business section, the services section, basically any other section...

Gosh, it must be so awful for the market for transcriptional sex to spill over to those innocent boards, with the foul unnatural acts that everyone should be prevented. . . oh wait everyone who isn't a test tube baby is a product of a sex act. And look it's being offered for sale, as a contract or service job. Seems appropriate I hope the law bothers to catch up with reality.

They might use certain obscure language as a form of steganography. Just like certain words are non-descriptive (but become descriptive over time) such as in street language or street names for [certain] drugs.