Dude, my feet go numb. I feel you.

well the difference between sex and getting a blowjob usually is that you dont have to do as much physical activity you can just lay back and enjoy it


so you are expanding your muscle tissues less which result in less blood flow compared to sex, your heart is not pumping as hard and the odds are you are not breathing as heavily either which might mean poor oxygen supply


i bet you're a smoker


also yeah i think poor blood circulation/lack of oxygen

You read this in your martial arts books?