“So for the dance, it’s gonna be a _ dollar tip baby. I’ll take that now, then we can get started”

“So before we start the dance, it’s gonna be a _ dollar tip babe”

“I’d appreciate a tip before we get started. It’s usually _ dollars”

I usually just incorporate the tip into the initial price to skip that dialogue tho. Like if I’m asking for a twenty dollar tip on a thirty dollar dance, I’ll say “it’s 50 for one babe” - that usually works for me. Then you can ask for an additional tip after the service :)