Perhaps one for the guys, but it could equally apply to the women:
This is a fantasy of mine...
Book a massage in a clean and professional looking place (regarded as upmarket) for a general back, shoulder and leg massage........
The masseur turns out to be very relaxing and very sexy.
Then out of the blue she asks, "Would you like some delightful extras?"
Would you resist the fire within your body, or succum to the ultimate massage, paid for in cash of course!
I'm not sure that I would be able to resist the offer.