Avoid blowjobs before fucking.
Seriously though, foreplay is key. Eat her out, make her cum, eat her out, make her cum, finger her, make her cum, fuck her, make her cum, stop fucking her, eat her out again (that’s always interesting to witness), make her cum again, then fuck, you cum, then hand her a T shirt and a bottle of water. She won’t give a fuck how “long you lasted”.
I’m not some guy who lasts 45 minutes of pure penetration and to be honest no woman wants to be fucked that long. If you (or your man if you are a woman) are having a hard time lasting, then change pace, slow it up, stay hard inside her, then speed up, slow down.
I guess premature ejaculation is a pretty common thing, so if it’s that, I think doctors have some solutions but I don’t really know. Usually the issue is the guy just starts fucking away like gangbusters, the girl sucked him off to almost cum already, so by the time he puts it in he has already been going crazy.
My approach: keep Sir Porkington of Essex County (my name for my penis) limp or unattended to as long as humanly possible. Make her cum a lot. That’s it.