First time I tried it was on a camping trip. The first night there, it was just me, my wife, a bud and his wife. He brought some Cialis and figured we could have a fun night before the others showed up the next day. We each took a hefty dose around 6pm. We cooked some food, had some beers and went into our tents. Within a few minutes my wife and I could hear them going at it like crazy. It was kinda funny to hear. My wife and I took part in marital relations as well, but there was no change in me. I figured that I was a non-responder. I thought "Well that sucks" and didn't give it another thought after that. The next day about 20 of our friends showed up. In the afternoon we headed to a pool on the campgrounds. We started drinking and fucking around in the pool. This was around 1:30pm. Around 2pm I realized I was in trouble. He I was, in this pool with about 20 friends, and I had this raging hard-on that I couldn't get rid of. Everytime I got that thing down, my wife would either look at me or brush up against me and I would be bonerfied again. This went on for about 5 hours. It was pure hell. Had this occured the night before it would have kicked ass, but it's no fun having a huge boner with 20 of your buds around.