How can I make him last longer?

My fieoncé and I have been together nearly 5 years. I was his first, and that first time it lasted for hours (I was seriously shocked and thought wow if he lasted this long this time what's it going to be like when he builds up his endurance?) well to my surprise, the next time we had sex it was so fast. Kind of what you would have expected from someone who has only had sex twice now. Anyway I assumed over time he would get to the point where he could last longer. He makes up for it in fore-play but it's just not the same. Does anyone know how I can help him last longer? He has tried getting off in the shower before but then he has to recover for so long we end up giving up. I thinking when we're married and able to do it daily and without condoms it will start lasting longer but I'm not sure... Help? Please