Viagra is a drug that helps men resolve the problem of erectile disfunction and enables them to have sex that they otherwise would be prevented from having sex. 

Allowing this drug to be legal and readily available is allowing men to make a choice that is being taken away from women.  

Taking away a women's right to choose to have a legal abortion, is like taking away a mans choice to take Viagra to force an erection.  If a man is naturally unable to get an erection, he shouldn't be allowed to force that because it isn't natural. 

The continued use of Viagra is clearly discrimination against women, and is sending a clear message that women are 3rd class citizens and not capable of making their own choices about their body.  Hence the same should be done to the use of Viagra, Men should not be allowed to make a choice about their bodies that is related to human reproduction either.