I can stay hard for hours, and fuck the shit out of my gf but after a while I get numb and can't cum. I become a fuck machine, and she nuts all over the fucking place. I will fuck for 3 hours straight, she's having a great time - I'm fucking blue balls trying to fucking nut for 2 of those hours before I have to pull out and jerk off hard on her tits/face/pussy/ass, whatever.

How do I beat death grip bros? I'm sure if I do solve this "problem" my gf will get less nuts, but I want to fucking cum; fuck this bitch.