YES!!!
Let me point something out. When you're fucking a big girl like this, you're mind is craving the thrusts to the point where you don't feel the muscular fatigue you would if you were just lifting weights.
That's the damn truth brother.
Yesterday I fucked some bitch for 80 minutes. For the final 20 minutes I was in another dimension just pounding that shit doggystyle. Seriously my head was way up in the clouds. Then I busted a load all over her back and collapsed on the bed, I came back to reality and I realized my heart was pounding out of my chest and I was dripping in sweat, but while I was fucking I didn't even really notice it.
The key is to keep fucking long and hard until you go into another dimension. Then keep going, further, further, further.....
Make sure you have a good training partner for this. My ex-girlfriend was HOT as fuck be she used to beg for me to stop after just ten minutes. I couldn't even nut. I had to jerk myself off afterwards just to get off. Fucking LAME.