No! They don't get to try the merchandise! You never ever have to shagg any if the rat bags who run these agencies. 

Don't go to the photo shoot! An don't sign up with the agency!

You have no idea where you're photos will end up!  They could be used for blackmail especially if you have you're face in them.

No decent agency will ever ask you to "audition" for them. Stay well clear! Find another agency or go indie!

You could, if you want to, have sex with him. But if you do, make sure you get paid first, in cash. It wouldn't be a fair test otherwise, would it?

More seriously, this is toxic. You could not trust such a bunch with any photos showing your face or any other identifying info, and the 'we' could imply more than one man, of course.

It's possible you will get a PM from someone, especially if you say roughly what area you are thinking of but you're discovering why many people don't use agencies.