I'm with most of the guys on this, some make you as hard than supermans dick, others leave you wondering if its ever going to come back out of wherever it retreated to.
Last time me and my g/f bothered to give it another go on pills....2 hours down the track, sweating like a slave we gave up and we fell asleep...while actually peaking. woke up the next morning still feeling horny, gave it another go and took me 1.5 hours to finish
Talk about a work out, too much effort really
The first time we had sex on pills it was another marathon and 25 mins in, i got this snapshot style image in my head of an empty underground carpark which promptly came back every 10 mins. now i hate carparks!