Or did I read this wrong: "£70 extra rate - The above including use of dildos & hand masturbation."
If I did misunderstand, then the casting wasn't clear to me, and maybe the models you're trying to work with.
Considering the casting includes this, perhaps two castings should have been made as this will most-likely horrify non-adult models upon reading it.
One casting for non-adult work and another for adult work. Simple.
You might have better luck if you split your castings up.
If you are looking for toys/finger penetration then have a casting specific to that or the other way around.
For example if I came across a casting saying "Looking for art nude model but will pay an extra £40 if you open your legs" I would think that ideally the photographer wants a higher level so I would rule myself out.
In the past people have sent me messages like "I would love to work with you, keep an eye out for my next casting" - I have to admit I usually forget about checking because I have so much other stuff to do when I'm online.
Or... "I have a casting up, please could you apply" - I applied once after receiving a message similar to that because I presumed he thought I was suitable and I was happy with taking the shoot on.. I never heard back from him, but did mention it in passing to a few other models (all of which have had the same message) so we just put him down as a bit of a time waster who must like to get a high rate of applicants. Chances are he booked none of those who he "urged" to apply.
Honestly just send a couple of models a message asking for a shoot and make it clear what you are looking for. Works for the rest of us!
I have to say that I get fed up with models who don't read the casting call re date, style, level or location. I get replies to "Model wanted for Adult nude shoot 31st, Midlands etc " casting calls with "I can't do the 31st and live in Cornwall, oh and by the way I only do fully clothed non-adult" which is a complete waste of time for all concerned.
PLEASE READ THE CASTING CALL BEFORE YOU REPLY