I've never bottomed (or topped for that matter). I was curious if there's any significant difference in sensation between a six-inch cock, which is considered average, and an eight-incher, which is considered large? Do those two inches really make that much of a difference? Same thing with girth...does a one or two inch difference change the sensation?
Assuming you've never had anything inserted in your ass before, take your little finger (which probably measures about two inches), lube it up and stick it in. Do you feel a significant difference between having it in there and not having anything in there? Sure you do.
Girth yes. Length not so much.
The difference is that second sphincter. A big one will get that deep. It hurts at first, then feels nice- with the prostate getting rubbed and everything.
It's all about the second hole baby. I had an 11 incher once. He rammed that thing all the way in me and I swear my voice went up an octave. It is heaven. And don't let these queen scare you with depends and all of that bullshit. My hole is still screaming tight and while I'm not a slut, I am very friendly with my favors.