Anonymous

It increases the flow of blood to the penis allowing it to erect. All 60 year old men don't need to take it.

Anonymous

It opens blood vessels increasing blood flow to the penis.

Anonymous

Viagra increases the blood flow to the penis, allowing it to engorge and become erect. Most men don't need it even into their 70s or older. Just some with other ailments like diabetes may need to take it.

Anonymous

Men beginning losing the ability to achieve and maintain an erection in their 40's. All men? No. Viagra allows a man to both achieve and maintain an erection. All men don't need it; all men don't take it; all 60 year old men don't need or take it.