From reddit: I used viagra every time me and my girlfriend had sex for the first year of our relationship
"Couldn't get it up the first time. Bought some viagra.
I must have fucked her over 150 times, and every time I swallowed a pill.
I tried to have sex without, but I'd end up going soft before I finished.
I thought I'd be taking it for the rest of my life.
Then we moved in and I decided it had to stop. Haven't taken any in 2 months...."