were to get viagra or cialis

Viagras great but when you finally get off you feel like the head of you cock blew up with it and then of course follows a massive headach haha
 
may be a stupid question but how does viagra works exactly? ive never used it and i wonder.. do you get an erection some minutes after eating it ? how long? do you get the erection whatever happens or only if you're excited ?
 
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