There is quite a significant differance in performance bewteen Viagra and Cialis. The old joke about taking V and walking around for hours with a massive hard on is probably a good analagy for how Viagra works.
With C you dont get that feeling at all, until you start foreplay, and then the response is both rapid and effective. The advantage of the 5 mg daily pill is that you are permanently "primed" and no pre-planning is required. If you take the 10 mg "on demand" pill its active in about 15 mins c/f at least an hour for V.
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