The Bare Fax was always quite good for lunch, especially on Fridays, and their special, invitation-only lunches around this time of year. If only it had cost just $6.50. I never got out that cheap....
You're just contracting for her time, not for any specific service. (Has any MA ever guaranteed a particular outcome of your visit or is it always a case of YMMV?)
I think it would be great but the ones I remember had too few real amateurs and too many breaks while the DJ tried to round up additional contestants. It would probably work best in a club that normally/often attracts a higher proportion of couples and females.