When Pfizer introduced Viagra, they contacted the Vatican to see if it would meet approval there. This was under Pope John Paul's reign, around 2005, I believe. The Vatican's stand at that time was that Viagra might restore vitality to many marriages and enthusically supported the drug.
Catholic Exchange simply stated that Viagra was not considered to go against nature as BCPs.
Phoenix brought up the fact that the Viagra users are generally post fertile and post human menopause but that's a whole different topic.
Only about 1/3 of all insurance companies actually pay for Viagra. The Vatican pharmacy does not ever dispense it nor does it dispense any birth control either. (I found it a bit odd that the medication most frequently dispensed by the Vatican pharmacy is Valium

btw, it does carry high end beauty products. go figure.
Viagra has directly caused the death of 16 users, hardly relevant.
I can't wait to talk to our pastor tomorrow night because I'd love to know what the "ordinary priests" think about all this.