text: .....viagra...? what is the effect of viagra?? if you are young, you have "plumbing " that works as good as it gets. however as you age valves don't work as well, cholesterol build-up takes it's toll and the "pipe" doesn't fill as well.  viagra minimizes the effects of the deterioration and provides old farts like me with a fuller "pipe". of course, for the most part, a new gf will do the same trick if the damage isn't too bad!  and no....it does not increase the libido or sex drive....it aids in the functioning of a man's equipment!