lol... there's a reason it's called head - seldom is much more than the head sucked
Funny how men discuss the length and girth of their dicks but not how deep their mouths are! Mine is a little over four inches deep before hitting the old uvular gag monster.
Ima big fella. I never force a mouth. I let cock worshipers practice and demonstrate their skills. If they want to gag on it that's their business. In my experience few do.
If I do start thrusting a hand or two wrapped around the base of my shaft controls how deep I go.