I' going to use the term Depth play which the concept of insertions of items as deep 48 '' or possibly more into the colon.for many there is a lot of pleasure in never getting past 12-18 in depth. It is a choice that you make. Getting started is the hard part and learning to process the feelings and discomforting even pain, Getting through approximately the first 10'' of the rectum which includes the Houston Valves often called the second sphincter for most is an arduous process. It is though to get started and maintain the stretch.If you really have the courage and desire to engage in depth play this stretch and beyond should be able to accommodate a 3'' toy 10to 12 inches long or a average hand and arm after some significant work.
The feelings ,stimulations and achievement all add to reasons why it is avidly done by so many. Some get really deep and big while others struggle.and stay smaller.
I make it a point to be throughly cleaned out with enemas or my preference colonic irrigation using a 48'' colon tube fully inserted. Can't stress this enough.
Having a partner assisting you is a real asset. I found the best way to make progress was the use of her hand ,wrist ,arm. It is also intimate. I do use and have silicone colon tubes in 63 fr. 90 fr.123fr, 163 fr and 2'' . the shortest is the 2'' @ 24''the longest is the 63fr@48''.the other 32-36 '' in length. also use 14''-- 3'' to 2'' tapered plug.But your partner's hand and arm are still the best. t
The stimulation can be huge if we get so lucky.
Lube is critical and J-lube or a 50/50/mix of crisco and cocoa butter with a bit of olive oil make great lubes if you use plenty. It took a while to get through the 2nd sphincter but once past progress improved. Tubes do feel great coming out. Don't know if we'll get arm in up to the elbow but it is close.
You will discover a lot about yourself and your partner .If you have one .Also you do need solo training .
If you can ever do it both with you and your partner go deep into each other at the same time, slowly and gently easing deeper and trying to be relaxed. Take your time, it can be a very intimate and passion filled occasion exploring each other internally.
how deep you go is where you wind up after giving it all you want out of the experience.