Pitch the scene you want to play
Looking for a quick sexting scene, a long-running romance, a particular kink, or a plot that may become explicit? Say so. A useful invitation gives another writer enough information to recognise a match: genre or setting, character or point of view, expected reply length and pace, and any firm limits.
For example: “Seeking a slow-paced fantasy scene in third person. Short paragraphs, explicit content by agreement, no humiliation. Start in-channel and discuss moving to PM first.” A specific pitch is easier to answer than “anyone want to RP?”