I dont think so. For me, longer or not doesn't matter. I did ask some girls, most of them said they dont want a long sex.
It means they expect a short sex, but dont too short. And we should know how to get the orgasmic feeling, not to know how to fuck longer to get so tired.
Normally I would do a first shot quite quick, depends on how tight it is. If I had a great feeling, the first shot won't take long. But after 5mins I would be able to do the second shot
The second shot will take longer, and I will try to make girls get orgasmic feeling. Cum again or not doesn't matter !
I'm very keen to please girls. So the first thing I would do is lick their body, nipples, DATY until they get horney as fuck. Then start to fuck
of course I enjoy while pleasing them as well.
Anyway, to get a better sex, a longer sex, u should try to improve your health first. Because in a sex battle, you will be the one who use the most energy.