But seems they don't do escorting just legit adult video productions,  
so if you're looking to escort as well contact someone like Pamela peaks.

Model Mayhem seems to run the gamut from those seeking mainstream, fully clothed modeling gigs ("No nudity") to more risque opportunities even as far as porn.  Kind of depends on how carefully you write your ad, I guess.  I have never seen anything stated totally explicitly.

Why not write directly to the production companies (look for contact info on their DVDs or websites)?  They will probably tell you to find an agent and maybe recommend someone or somefew