This 'scare' started about 12 years ago, based on a study done with cyclists who averaged just INSANE mileage totals weekly; their 'risk' of impotence went from 2% of the test group to 4%.
Danger? You make the call. My daughter says not to worry. (Well, not exactly, but since she's HERE, I'd say you're likely pretty safe. I've ridden double your weekly estimated mileage for over a decade now.