That's what I thought....but I think, altho I am not sure, that its actions are specific to the corpora cavernosum
No Moose, It inhibits the enzyme that breaks down nitric oxide (phosphodiesterase Type 5).
This happens thru-out the body. Remember, it was originally a blood pressure/angina medicine, to increase blood flow thru-out the body.
Thats why your skin turns red when you take it-causing more blood to flow to the surface of the skin.
Remember, Viagra was one of the drugs that Hide got busted with at Los Angelas Airport.
It will give you phonomenal muscle pumps.