I don’t understand the logic. Why would you choose this path? Disclosing the nature of the scenes during hiring would only attract exactly the people who are already comfortable with performing the content.

The only reason to hide it would be to attach more popular names to your title, but think that through. So you’ve trapped your talent, and sprung a spicy scene on them last minute, now what?

They’ll:

a) flat out refuse

b) maybe sue you

c) give an uncomfortable, lackluster performance

d) happen to be cool with it and also give a good performance

D is both the only really good outcome, and by far the least probable, 10% chance tops.

C isn’t great, but at least their name is on the box, and they do the other parts well. I’d say about 40% probability.

A means more complications any way you slice it, either editing scenes or hiring additional talent, probably about 30%, .

B is about 15%, leaving 5% for the lizardmen.

If the content is that crucial to the product, find a performer who is willing and able to do it well.