I'll never understand why the prospect of screening is so hard for guys to stomach.
These women are bringing strange men into their lives on a daily basis. If it were me I would want to know who the hell I'm sharing my bed with.
And let's be honest, as a guy, the same doesn't apply to us. We don't care who the girl is beyond, are they attractive and will they perform the acts I want them to perform. So give the whole "the sp should provide id also" argument a rest.
The risk is almost all on the sp in these encounters. If your biggest fear in this hobby is being "outed" maybe don't engage in these activities to start.
Protect the safety of these girls and appreciate the service they provide. If you don't like the game, don't play.