There is nothing you can say to a WG, or ask her to do, which she hasn't heard before.
Things that sound embarrassing or hilarious to us might once have sounded hilarious to her, too. Once. But now that she's been asked for whatever it is by about a hundred other punters, she'll just fetch the required implement and get to work. (Or, if she's Romanian, she'll say "is extra" or "I not offer that service".)
Any of you had this service and do they cane over trousers? Is the pain absolute agony?
I have no direct experience, but I would guess the answers to be, "Wherever you want, with whatever you want," and "It's up to you."