Q – I am an experience anal player. My ass can easily take the larges diameter toys and even two fist. But there is a hard stop, a solid wall up there that stops anything going deeper than about 6 to 8 inches [15 cm – 20 cm]. What’s the story? Is the pelvis obstructing things? How do I push through it? How do I get a fist elbow deep or burry an anal toy over a foot long up my/anyone’s ass?
A- The “hard wall” you are hitting is the underside of your sacrum [<- medical link].
It is a “wall” (of sorts) you can’t push through it. This wall is encountered about 2/3 to 3/4 of the way up your rectum, 6 – 8 inches from the outer rim of you anus. Don’t worry about your pelvis. You body will easily take a female (any) hand.
The underside of the sacrum has a gentle curved but is not smooth. So the shape of the head, and generally the design, of the toy you try to push through the bend under the sacrum will have a big impact on your success. The head of the toy needs to be smooth and rounded to follow the curved under-surface of the sacrum and not get caught on any of the surface features. Fisting partners also need to work with this curvature. Bending fingers and further tilting the wrist into the abdominal cavity (towards the belly button) is the path. The fingers and hand will then be above the bladder and in a position to easily produce a lower belly bulge and generally push the belly button out.
Keep in mind also that when you are upright or on your back, the weight of all your internal organs and intestines are pressing down on your rectum and anus. The colon is literally squashed flat and the bends/corners become folds that are harder to follow and navigate. Kneeling on all fours or, better still, ass-up with head and shoulders on the matt will dramatically straighten everything out. The rectum will be drawn away from the back and out from under the sacrum. That does not mean you will be able to ignore the natural curves, it just make navigation easier.
If you haven’t already figured it out, the anal canal is roughly in line with a line you can draw from your anus to your belly button. When “relaxed”, the anorectal junction forms a right-angle turn towards the back, around and behind the coccyx. Over time, the body adjusts/learns to straighten out the anorectal junction to accommodate anal penetration. Similarly, once you do successfully navigate out from under the sacrum and into the abdominal cavity, it gets easier and easier very quickly.
NB – The sacrum is the lower part of the spine. Important nerves pass through this structure. If you start feeling tingling in any of the lower parts of your body (legs) you are squashing nerves. Pushing too hard can also bruise or otherwise damage the colon. If you see any blood you have caused a fissure and you need to give it a rest of at least a couple of days.
There are two toys that are particularly good for this type of depth training:-