It is possible that you dream of or become aware of a usually repressed need or issue when you are asleep, and the feeling residue of that is still there when you awake. It is possible that you don't remember the actual dream or awareness when you awake, because your conscious mind immediately censors it or represses it again.

This may not be specifically about a sexual desire. Instead, your psyche may be converting a nonsexual issue into something sexual, to encourage it to be confronted in real life, by helping it to break through your repression barrier. It may not be a socially approved way of confronting your issues, but parts of our minds do not worry about ethics or social correctness. Resolution and relief often take priority in the distressed mind, regardless of the potential consequences in the real world.

Sexual expression of our nonsexual issues is sometimes the path of least resistance, since we so intensely respond to anything that makes us feel sexually aroused. For example, someone who has felt unseen or ignored much of his/her life, may later on develop an exhibition fetish. It would be the mind's way of bringing the feelings of being ignored to the surface or to the person's attention, so that they can be potentially resolved or healed. It is no different than other ways in which our minds sometimes produce psychosomatic symptoms.

What you write in your Craigslist post may provide clues as to whatever is seeking resolution in the real world, especially if you are desiring a specific scenario (a symbolic acting out of something).

You might want to read some of the articles and books written by Arthur Janov, who was famous for his books on primal therapy and the Primal Scream. He has extensively addressed the topic of the sexual acting out of nonsexual issues. It is quite fascinating.