We all know that motorcycles are dangerous. But for your sex life too? A study carried out by doctors in Japan has revealed men that ride motorcycles are at risk of impotence and urinary problems because the vibrations of the engine damage nerves in their penises. The survey of more than 230 motorcyclists who rode their bikes for about 3 hours every weekend found almost 70% had problems gaining an erection or emptying their bladders. The reasons: 1-motorcycle seat undue pressure on the perineum, that unknown area between the anus and the scrotum. The pressure can restrict blood flow. 2- vibrations from the engine caused a decrease in two growth hormones in the bladder and prostate related to bladder relaxation. I didn’t know that such a number of bikers had trouble getting one up.