Spend sometime with yourself, pleasure yourself, there is nothing wrong if you Ma5turbate when you are married or in a serious relationship. This helps, when you are H0rny while having S3x and it helps you to control.
Do not rush while you Ma5turbate. Take time with your little soldier, watch something N@ughty (P0rn) or talk dirty to your girl over the phone, while Ma5turbating.
Every time you think you are about to Ejaculete, hold back and think about something else. The more you practice holding back, the more easier it will be for you to last longer in bed.
When you are having S3x, remember the one on top has the control. So it’s simple spend more time on top of your partner. When you are in charge, you can decided your pace or stop when you think you are about to Ejaculete.