I'm still here
It could be a few different things.
Try doing some other activities when you feel like ejaculation coming, like pleasure your partner whilst you calm down.
You can try and withdraw and use a method of squeezing the end of your penis to prevent ejaculation. You might need to discuss with your partner prior or they might look at you fuuny
It's often found to be an anxiety thing where the guys are often very horny and keen to impress, which ends up in the guy being less than impressive.
You can always use the "Rosanne Barr Naked, Rosanne Bar Naked". Their gone.