I've had lunch with female business associates a lot. I think its become more acceptable in business these days. Keep in mind, when I set these up I always invite others in their firm but if she shows up alone, I don't take it as a signal that she is looking for anything. Now, if she starts rubbing her foot against my leg....
Actually, that has never happened. My wife as asked before if I've ever been approached when I'm traveling (like you see on TV all the time) and I sadly say no. I travel a lot and honestly it has never happened. For one, I wear my ring. For another I guess I don't frequent those types of places but you would think that in 15 years of travel I would at least get approached just once. Just once!! Please, for my own ego, someone approach me!!!!!
1) Arrange a trip to Las Vegas.
2) Wear business attire (tie optional).
3) Go to the Island Lounge at Mandalay Bay shortly after midnight on a Friday or Saturday night.
Your problem will be solved in short order. Though the payment arrangements might be a bit problematic. ;)