Thought you may want some more tips.
Have you tried playing hard to get with your boyfriend.
Next time when he gets into the mood for making love, try making it
harder for him to get to you. For example you could make it hard
for him to take off your clothes. Getting naked too fast, kinds of
shortened the built up. I think guys like making love to half naked
girls and then slowly built it up to a complete skin on skin.
And when both of you are completely naked - touch him a lot. It can
be any part of his body. Discover for yourself. Don't know about
your boyfriend but if you start nibbling my ears - I may just hit
nirvana immediately.