From what I am reading it sounds as though you are saying that love making is taking to long for you and with this you are loosing interest, therefore, your sexual pleasure/satisfaction is suffering..... it that right?

I would suggest that you and your boyfriend go for a few quickies in slightly dangerous (might get seen) places and see if the thrill of getting caught mixed with with the passion of a quickie does any thing for you.

And the most important matter to remember is "COMMUNICATION" - it is the key to sexual satisfaction for both partners..... show & tell at its finest.