As per ongoing examinations by Richard Weil, MEd, CDE for MedicineNet.com"a investigation of perineal pressure and blood stream to the penis in male cyclists showed that penile blood supply diminished fundamentally in 70% of the 40 cyclists who partook in the review. Deadness in the genital region was accounted for by 61% of the cyclists, and 19% of the cyclists who rode their bicycles in excess of 250 miles each week whined of erectile brokenness."