It seems you did not spend time in a foreplay in second intercourse. Usually one gets ready after 30 minutes of the first intercourse.
Got a similar question... I have the same problem, but the difference is this... I reach to the orgasm too early, but can't twice... I could be doing it but will not reach again, just stays there as a dildo... Not bad at least for my girlfriend, but I'm curious...
Hi Bongo, I think you were just trying to hard, as men we need to relax to ejeculate, and when you get that sensation to ejectulate focus on it and it will happen, even on the third time.
Good Luck
Google "refractory period in ejaculation."