First, I am glad to hear the reply is talking about safe sex! Very mature and responsible! I am proud of you, aat08. I will tell you another way to help you to last a bit longer, though I shouldn't be contributing to before marriage sex. You really should be committing to the women you are taking a special part of, as this is something that cannot be replaced and is something that means more to them than they realize right now.
One tactic that you can do is to place your finger and thumb like a circle around the top of your scrotum and lightly pinch, like a rubber band feeling, right before you feel the sensation of orgasm. You can also incorporate this into your relationship with your partner where she does this for you to assist with the length of time for love-making. It's a gentle squeeze above the nuts, that will help you to maintain control.
The other thought that comes to my mind is that you can practice masturbation on your own where you build up your own endurance. You certainly do not need to be thinking of other things while you are with this woman, should you be performing an act which is supposed to be an expression of your love. Build up your endurance on your own, so you can respectfully apply yourself and your attention to the woman you are sharing a very important and intimate closeness with when you are doing this.
No need for thanks, just think deeply and with your heart about what you are doing when you are doing this.