The science of anal suction?

As someone who delights in shoving all manner of stuff up my bum, I'm constantly restrained by my fear of having my own story here: https://en.zity.biz/index.php?mx=forum;ox=display;topic=14643 (I used to have an account here, a decade ago… that was such a great thread).

What I can't seem to find is anything straight-forward on the science of the ‘suction effect’, ‘anal seal’, ‘rectum vacuum’ and so on. Specifically, how is it that feces have no trouble being pushed out, but objects aren't? Or even more specifically, your garden variety mouse ball. (The computer kind, fellow freaks! 😃 )

If you were to push a mouse ball deep into the sigmoid, past the bend, then what prevents it from eventually coming out? Why won't feces behind it push it, or surround it and carry it down into the rectum?

Are a lot of the stories of things being stuck just people panicking because they can't get something right now and aren't able to wait a couple of days? If the suction were so great, how do we even poop?

I keep trying for depth play, but if I insert a thinner 9" dildo as far as my fingertips can push it (with a string through the base!) it 1) won't go further (So I'm not navigating the bend?) and 2) invariably starts pushing back out after awhile, especially if I stand up.

So if there are still people who are nurses, or friends with them or just have this knowledge I'd very much love to know the “rules” of how this suction works. I've been playing for over a decade pushing dildoes with balls on all the way in and never once had anything stuck. I'm at the point of wanting to experiment with pushing balls and maybe potatoes far out of reach, to feel them deep inside, but I don't want my private perversion to be the talk of the local ER. 😉

I had a couple of chrome metal balls, 2" diameter, that had holes drilled in them to attach a retrieval cord and thank god I did. I really enjoyed them and even on occasion would sleep all night with them in me. That sounds exotic but actually I was a little sore internally in the morning and ended that practice. So one evening in the middle of a session I had both balls inserted in me and went to pull them out…first one no problem, came right out…second one got stuck! I pulled on that retrieval cord, I pushed, pulled, changed positions and tried everything but couldn't get it out. Finally in one of my position changes it popped loose. I think it got stuck behind my second sphincter until that relaxed I could get it out. I often think about that when I see women putting 7-8 billiard balls up their ass. Truth is they will, in all likely hood, come out on their own but still a little scary.

Only other experience like that was I had some semi large anal beads, (Falcon Balls) all attached to a shaft but very long…I'd say maybe 16 inches or so, very deep. I pushed them way up, all the way to the hilt. They felt awesome so I decided let's augment this with an enema. Well the enema washed away all the lube so when I went to pull them out they wouldn't come out! I felt like I was semi tearing my guts out as I coaxed those babies out of me but I got them out with no repercussions. Note to self: Don't do an enema while playing deep with Falcon Balls!

I have inserted all sorts of objects some hard some soft some plastic some metal and I have never lost anything up there and there was a few items that took some time to coax them out. I even had a NyQuil triangular bottle all the way up to the cap. Speaking about a full hole.

Thanks for the replies.

I've been experimenting with glass balls recently; no retrieval cord. They're the “fortune teller” ones you can order online and I have one that's 2 ½ inches. So far, no trouble at all going in or coming out, heavily lubed. I wonder if the time that the steel ball got stuck for you (CAT3) if it would have eventually just come out. When I manage to get these in so deep I can't feel with the tip of my finger any more (pushing in as far as I can get my finger), it comes back out in about half an hour. I'm still really curious about the science here, since I'd think the force from behind would “push”!

I really enjoy that “full hole” sensation. There's a “shower shampoo bottle” porn vid on xvideos of this girl doing a full sized bottle (I think I've bought the same brand heh!) and I've managed to duplicate that. 😉 Since everything comes back out, I'm really just very curious still about what would actually cause something stuck (beyond dried lube on Falcon balls, but even then, you'd think eventually they'd descend?).

I've been experimenting, with some dildos with the suction base off and with a string, and they just don't seem to go in beyond the first bend. It's so odd because one's only 6" or so, and I can “disappear” a 12" all the way in (though it stops in the same place!). What is it there that I'm hitting?

I know I'm probably really pushing it (hah!) trying to go further and further, but the sensation really is amazing to me and a huge turn on. I wish there were some scientific resources out there, but I guess it's still somewhat taboo. (Science like how there was that paper on how long it took for a swallowed lego to come out the other end lol!)

I’m also quite interested in this topic delver. I just see some people shove so many toy balls and what not up their ass that I’m shocked to see they don’t get stuck. But then again that’s only what I see. I’m guessing these people have been doing it a while and gotten use to it? But from my personal experience, I’ve had a few close calls when the objects wouldn’t come out straight away, but I managed to get them out in like 3 minutes. For all I know they could have come out on their own time. lately I’ve been trying out some anal beads (4 total) followed up by 5 mini billiard balls, with the anal beads acting as a sort of safety net. So far I haven’t had much trouble. But I would also like to experiement shoving something deep and leaving it their for a little while, but of course it’s waaaaaay to risky. Let me know how it goes delver.