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@Khornight2
What a load of balls, my dad did more miles than that for about 40 years, during which time he fathered 4 children the last one when he was in his late 40s.
May be genitic, but between my dad and myself (also generally do more miles than that and have had no problems with fucundanty) i have an 1/8th of the statistical evidanence they are using... 15 triatheletes... that's hardly a good survey number... sounds more like triathalons reduce sperm count to me?
It should also be noted that sitting in a carseat for long periods has exactly the same effect as cycling...