That is how I do it, I find it the easiest position out of all of them that i've read about and a whole lot easier than the laying down position.
Still, the average person can suck too if they maintain proper stretching, yoga, and have a big cock.
The feeling of cumming inside yourself is a feeling like no other.
After decades of jacking, I've gotten so habituated to the feel of my hand that it's very hard to cum any other way.