Journalist Drs Vincent J.M. Bakker (Amsterdam, 1948) studied economic sociology and published five books about economic affairs, including a study about the Economics of Love and the Red Light District (1996). "As a John I became interested in the difference between paid and unpaid sex," the author explains. "My conclusion: if you pay in advance, we call it insensitive prostitution, if you pay afterwards it was a loving marriage." He became intrigued by another John. Love bandit John Watson turned the rules upside down, girls paying him for his love. The author was the first to introduce graph...