Man whose penis remained stiff for 21 days - not because of any Viagra, but because of a medical problem

Viagra is a wonder drug that has helped a number of men and their relationships, in cases where the man has not been able to be sexually able to sustain the relationship. In most cultures, being sexually virile is always considered to be something that men should treasure, and something that makes them more attractive. However, consider the case where a man suffered a medical condition known as 'priapism', where the blood flow in the make organ was not able to flow out, and hence the person remained in a painful condition for as much as 21 days (link to article):

A 55-year-old Kolkata businessman found out what it would perhaps be like to have an overdose of Viagra. The father of two, ended up with a prolonged erection that lasted for — hold your breath — a full 21 days.
While for normal individuals, penile erection subsides once sexual excitement has ceased, victims of priapism fail to return to a normal state. Prolonged erection usually leads to a permanent damage to the penis and could even cause death. It has to be treated within six hours, but doctors in this case managed to save his life.