TOKYO, Japan (CNN) -- At first glance, the man and woman at the nightclub look like any other couple on a date. He flirts and pours champagne. She looks at him and laughs. Businesswomen in Japan pay up to $50,000 a night for male companionship from "hosts" like Yunosuke. This isn't a date, though. It's business. The woman, a successful executive, has joined a growing number of professional women in Japan in forking out from $1,000 to $50,000 a night for male companionship. They meet their "hosts" in hundreds of clubs that have sprung up around Tokyo - the industry...