I need serious help here.

[Untouch]

Have a wank before you have sex then. It's that simple and works fine.

[Knight]

Try to masterbate frequently and get your penis used to ejaculation.

[NekoChan]

Masturbating doesn't always help as it didn't help me.

[Knight]

Well he might not have pre-mature ejaculation, he just might not be used to it.

[Vital Signs]

Well he might not have pre-mature ejaculation, he just might not be used to it.

Actually I'm wondering if that's it. Each time I've done it I've lasted longer. I still haven't actually had it that much yet, but I believe it will slowly change over time.

[Melted oreo]

Do it more and each time do it longer and so on.

[Ruyuk]

Seriously, fap off more often, It should help. Fap before sex too.
Numb out your dick.
After you finish, just keep kissing her and pleasuring her for the next 5 minutes and then you should be able to get your crank back on...