The reason, Foster argues, is that impotence implies a lack of virility, a lack of manliness.
It is the cornea—the last redoubt of virility and independence.
Predictably then, if oddly too, this man's very existence had become a test of Indian virility.
virility vi·ril·i·ty (və-rĭl'ĭ-tē)
The quality or state of being virile.
Masculine vigor; potency.