There are two sub- forums (M4M & M4W). Be nice if you added a couple others. (W4W,W4M, Couples 4, BDSM,etc). With strict rules they conform to the overall heading of "not for pay".
May not be that many non-sp women looking to play but there ARE some. And perhaps they are out off by the overwhelming number of SP ads normally in the W4M catagory.
I've met non- professional women through Craigslist and other ad places in the past.