Studies have already claimed cyclists face an increased risk of impotence and now a Japanese team say motorbike riders, of whom there are 3.5million, mainly men, in Britain are likely to share the problem.
They say it is because pressure and vibration from the saddle reduces the blood supply to their genitals.
The older the biker, the worse the problem was. More than nine out of 10 over-50s had signs of impotence.












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