In reply to buzby:
> Could Viagra enhance climbing performance.
> well it certainly enhances my performance, but then im getting on in years. :>))
It diminishes mine, I can't get my hips close enough to the rock (although, maintaining a third point of contact is easier).
Seriously though, Viagra was developed as an anti-angina drug so it isn't implausible that it might affect circulation in a beneficial way. I have met climbers chugging beetroot juice before RPs as it supposedly also affects vasodilation (albeit supposedly through a different, nitrate based mechanism ).