Wear a wedding ring. Women always want want they figure they can't have.
Plus they see the wedding ring, they think you're one of the good ones thats taken.
Plus, having an affair with someone they think is married, adds excitement and spice to their life.
P.S. This only works on women who are below a certain age. That certain age is when their biological clock starts ticking and they want to settle down and have kids... therefore they usually don't give married men a second look.... thats where they turn to the safe, reliable, friend zone...