if the hole is small enough it can stay attached to your dick because it restricts blodd flow. trust me i know i tie up my dick with string every night
I used one once without knowing what they were for. Was going through a phase with my ex where we bought a heap of random stuff like that and a vibrating cock ring happened to be one. Used it at the same time I used a 'plump' up cream or something so even then I didn't realize that I grew a bit because of the ring. The ex seemed to like it and now I don't know how I feel about that.
You've probably already learned about this since you seem familiar with this topic, but I do want to warn you that ya shouldn't leave it tied/leave a cock-ring on for longer than like 20-30 minutes. Otherwise it can be a bad time for DangleVill.
I'm not talking about the actual mental disorder, I'm using "autism" as a general term for stupidity/ineptitude. Something people do a lot around here. And something that, if I'm not mistaken, was popularized by 4chan.