If you take a look at some more extreme porn you will see vaginal and anal insertion of non-penile objects as small as baseball bats and arms and wine bottles and as large as tree trunks. You’ll even see dildos as broad as a muscled thigh, often the orifice looks strange compared to most.
Hell for a famous example look at “goat sex man” which unlike the name would suggest was not bestiality but instead a picture of a man using his hands to hold open his anal sphincter so wide you could see his rectum. :eek:
What is the deal with this? Can this stuff lead to real and lasting damage?
Well thats a puncture wound or a tear, which is a risk I know, but when it happens in porn they are using blunt(er) objects and LOTS of lube plus it is obvious they have worked up to such a large object. Does the stretching itself lead to problems?
I see references saying no but being able to hold your anal sphincter open is obviously not normal anatomy.
Well, a baby’s head and shoulders passes through the Vagina. Anything bigger than that will probably cause injury. I think its safe to assume a bowling ball won’t fit.
Well, there once was a guy in a multi-car traffic accident who was found in the hospital to have had an entire v-6 engine jammed far, far up his anus–amazingly, doctors discovered that he actually had a little more room in there for an even bigger engine. His groggy response?
Actually, I would not be surprised if in many cases little to no damage was done. The human body can do surprising things - take a contortionist for example. I would injure myself trying to fit into an 18" glass cube, but with training and practice (and some biological luck) it can be done. If you take time and work up to a major insertion (as a womans body does in preparation for birth, which is going the other way), there is no reason it could not be done.
Done incautiously and without such prep, and a damaging or fatal injury could easily result.
As some have pointed out, most women stretch their vagina large enough to fit a 7-lb object. However, they have hormones that assist in this and it happens somewhat slowly. I would imagine any of the damage comes from tensing up so that stretching could pull and tear not just skin but the underlying muscles. Or, as one old timer told me about child-birth, “by the fifth or sixth they get so loose it just pops out easily…”
There was a case I read about in Canada many years ago where two women got into a drunken fight, one grabbed the broom and stuck it up the other’s rectum, then made her sweep the floor. She later died from internal infections and damage.
The problem is not diameter, but that the colon (and intestines) are not designed to be as hardy as a vagina; they make thier own “foreign object” that is usually pretty soft and mushy. SO tearing is a real danger with excessively large, excessively hard objects. Of course, there’s a big difference between found household object with the risk of splinters, purpose made plastic object with less risk of damage, or human appendages as long as there are no fingernails to tear the wall.
Plus, with the amount of unusual bacteria in the colon, giving that stuff a direct path to the bloodstream via a cut is a really bad idea. It’s why people shot in the gut risk a slow, painful death without serious medical intervention.
It’s said that the reason why women are more likely to catch AIDS than men is that vigorous sex, even done right, can leave tiny tears on the soft tissue of the vagina. It’s also one reason why uncircumcised men are more likely to get AIDS from sex - the foreskin will also experience the microtears inside, and inside dries slowwer so the virus has more time to get in. The colon is even less hardy, which is why (as well as promiscuity) AIDS was originally found most commonly in gay men.
But done carefully and not vigorously, with the proper “tools”, my guess is the only permanent damage is loosening of the muscles, and some santorum stains on the bedding.
I think its safe to assume a bowling ball won’t fit. 
Ok not a redwood but a small tree trunk yea.