Incest Survivors Support Group
Incest refers to any sexual activity between closely related persons that is illegal or socially taboo. Consensual adult incest is very rare. Incest between adults and prepubescent or adolescent children is a form of child sexual abuse that has been shown to be one of the most extreme forms of childhood trauma. If you or a loved one is a survivor of incest, join the group...


I'm familiar with the Adult Baby-Diaper Lovers (ABDL) phenomena, because a very dear friend of mine on here had the condition. When I first met him almost four years ago, I was relatively unfamiliar with ABDL, so I set out to learn more. What I found was that very little research has been done on the topic, most likely for the reason you mentioned above. It's often dismissed as merely a kinky sexual fetish, and very few have found it worthy of investigation. I did, however, come across an Italian study that explored the topic, which you can find here:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7068517/
It is a lengthy and scientific read, but perhaps you might find parts of it interesting.
To summarize the article, researchers concluded that ABDL fantasies seemed to be caused mainly by physiological factors like sphincteric control troubles, and psychological factors like childhood abuse and premature parental loss. The behaviors themselves were found to be a means of obtaining sexual gratification, as well as a strategy used to cope with negative mood states, like anxiety and depression.
In my friend's case, childhood sexual abuse was the reason why he was an adult baby. Perhaps it may be the reason in your case. I would connect you with my friend, but he passed away a few months ago. I will forever be grateful for all that he taught me about what life is like for an adult baby,
I hope you find the answers you are seeking.
I hope you are well. I know this is a very intimate and sensitive topic and it was good you reached out.