I cant do the porn excuse, or the masturbation either. Hell, depending who im with and how many times she and I cum, I can still rub one off after we are done.
Again, it all comes down to the brain. You have to be connected to not just her, but yourself also. You have to know what makes you tick.
I had one few months ago that swore she was a one and done woman. I taught her how to breathe properly, smell, taste. She can cum over and over again now. And every once in awhile gives me a call when her boyfriend cant get the job done.
You have to do the same to yourself....to find yourself. So much more than slapping your cock on her clit a couple times to rev her up and then jamming your cock in to see if you can obliterate her cervix. Breathe, smell, taste, break up that rhythm...find yourself.