It would work better if you approached art schools directly. If they have live art classes, they'll be in need of models.

You might be able to find some opportunities on MM - that's how I got connected to the live art group I've posed for before: met a painter on there who got me in touch with the co-ordinator of a live art group at a different university.

I miss live art modeling, though. Wish I had more opportunities to do some, but it's limited here in Halifax!