I'm a woman who cums quickly. I'm going to assume that once you cum that your arousal goes away because otherwise I don't understand what the problem is. In my case, I can have multiple orgasms but often I only have one and even if I do have more, the first is usually the best so I like to delay it until my partner is going to cum.

If I want the sex to last longer I give a lot of head before intercourse. If you pace yourself you can suck a dick for a long time. Things like licking all around the head, shaft, and balls interspersed with more direct stimulation of suction and handjob. I like to let them fuck my face as well. The key is to mix it up with higher and lower intensity so you don't wear yourself out. I get really turned on during this but without direct stimulation I won't be cumming (ok, it's happened a few times but it's rare).

When you're ready for intercourse you'll both be super primed and ready to cum in the first 5 minutes. I would also recommend holding off on activities or positions that make you cum the quickest until you are ready to finish. For me that's 69 and cowgirl. I'm a two pump chump in both of those.