That's bullshit. Guys joke about jerking off all of the time. I remember one friend of mine telling me that his dry spell had lasted so long that he could now switch hands during masturbation and not miss a stroke. The truth is until recently toys for guys just weren't very good. You could put your dick in the vinyl vagina of a blowup doll or other uncomfortable and embarrassing to use devices but in the end your hand (good ol' Rosie Palmer) was the best choice.