In addition to adding toys to your 'adult play time', there are some excellent instructional videos out there - no, I don't mean you-tube - on websites like Adam and Eve. We are not born knowing how our bodies actually work sexually. I find simultaneous clitoral and g-spot stimulation work best and can be done during intercourse with mind blowing results. Also, a cock ring is a simple solution for men who prematurely ejaculate as it helps them maintain an erection much longer. Knowing exactly where your g-spot is a must as well. Also, it takes PRACTICE. If anything you try doesn't work the first time, let it go for the day and try again later.

Good luck and have fun!