Possibly the prolonged exposure at the time he lost his legs produced permanent injury to the blood-vessels and nerves of the penis.

There is a case on record in which, in a man of thirty-seven, gangrene of the penis followed delirium tremens, and was attributed to alcoholism.

Quoted by Jacobson, Troisfontaines records a case of gangrene of the skin and body of the penis in a young man, and without any apparent cause.

Schutz speaks of regeneration of the penis after gangrenous destruction.
Gangrene of the penis does not necessarily hinder the performance of marital functions.

Chance mentions a man whose penis sloughed off, leaving only a nipple-like remnant.