The ones who make a big song and dance about wanting to be your first booking of the day. Like dude if you don't think I'm going to wash in between guys why are you booking me in the first place?
I actually said this to one of them once. And he was all "oh no of course I know you'll have a wash, I'm not being rude!", so I said, why does it matter then? It's like they think that going to sleep and waking up the next day suddenly magically erases any previous whoring.
If you don't want to have sex with a prostitute DON'T HAVE SEX WITH A PROSTITUTE jesus christ it's not difficult.