Not really the place for it, you'd need to do the NSFW part through DMs as this isn't an 18+ platform, but the 1x1 section would be your best bet.

Post an interests list and indicate that you're looking for someone who would be interested in your RPs having a lewd DM aspect.

The general approach here is if Xavier Bloodbayne Milanthropos III, Esq. and Belladona Von Bootycheeks are going into another room to do the horizontal mambo that's basically all you post.  Just...

"Xavier Bloodbayne Milblahblah and Belladona Von Bootybuttcheeks walked through the door to their private room and closed it securely behind them, double checking to be sure they had privacy."

And then fade to black