I've never cheated on anyone in the past...then again, that's largely due to my belief that monogamy isn't a natural permanent state of human relationships. I never really saw any value in being exclusively attached, so I never was. At least, not before I met my wife. :biggrin1:
At this point in my life, I still believe as I always have...monogamy is not a natural state. However, I also believe that what makes us innately human and distinguishes us from the other species is our ability to use reason to assert dominance over our baser instincts.