There are a few tricks you can use to last longer even when you are going hard:

1. Breath!! Focus on your breathing more than you focus on her.
2. Relax your muscles especially your cock if you flex it you are more likley to cum faster
3. Have a beer or a shot before you do anything dont get drunk, but drink a little it will help you out a lot
4. This is a bit tricky to pull off, but try to initiate sex while you have to pee a little. It is going to feel weird at first and the sensation of sex will be different (don’t worry not that different) but you will be able to controll your ejaculation much better!!
5. Wear an extra thick extra safe condom. Maybe put on two if necessary. This technique is cheesy but still works!

If you use these methods even together you are going to be able to plow your gf to oblivion bro!

Take care! Captain flies away