I am not sure if such a business idea has ever surfaced here before, so I am going to throw it out there.
Many of us are out of shape; we hear about the statistics (2/3 of the country being overweight, nearly 30% being obese). We spend more time sitting down than moving around (like reading this message), as our lifestyle become more sedative.
So in order to benefit both parties (the guy and the gal), why not have a workout session that doesn't involve horizontal tango? Guys love to workout with the presence of pretty ladies. I am guessing the fees may not be as high as BCD session but the ladies get to exercise without leaving their place, and be paid for it.
To make it more interesting, get a Wii or Xbox with the activity program / game. For the more intense, try P90x or Insanity program and you will burn 2, 3 or 4x more calories than BCD.
Why pay a army drill sergant who's going to kick your butt as a trainer at the gym, when you can have a pretty lady, exercising with you. Clothing attire is strictly up to the comfort of parties involved.
I don't think I am going to get any benefit for introducing this idea, but if any gals want tips and ideas on the training aspect, I can be a consultant and we can workout together (free trade).
Be healthy and you'll be happy.