I've seem to remember reading that some animal species in nature don't have an ability to 'hold it', if you know what I mean.
I''ve been a sci-fi buff for a while, and I'm sure that many enthusiasts of the genre would be familiar with the concept of different evolutionary paths for various 'alien' races, and what-not.
In the '*BDL' genre, some sort of diapers usually make an entrance somewhere. Some authors have made use of such themes as alternate realities, with delayed potty training, or no potty training, as part of thier 'story universe'.
Intriguingly enough, I am wondering what could/would likely be different about a society where the large majority of the population were functionally incontinent, with centuries of history with that being the 'norm'.
Some obvious changes might be the lack or alteration of standard plumbing fixtures (ie, toilets might be replaced with something else, or not present).
Maybe there might not be as much of a societal taboo about natural functions and byproducts. maybe less of a 'modesty' issue, say, if clothing was unnecessary. Diapers were developed, mainly, as a means for keeping other clothing and various places isolated from natural byproducts, after all, which is percieved as a societal 'need', and which is also seen as a biological 'need', in our society.
I am curious as to where speculation might lead, from this premise, on how such a society would differ from what we know, and what might be expected to remain the same. Also, whether such a society would likely cease to exist, due to evolutionary pressures extant on a 'civilized' species, and other branching topics.