Comment by Johnny555
I'm surprised nobody said "porn" given how much traffic those sites drive -- is offline porn still easy to find? Last time I looked for offline porn, it was at the local video rental store in the back room section that said "Adults only", but now those stores are long gone.
Are those "Lingerie and Adult Toys" stores on the outskirts of town filled with DVD's and magazines?
As mentioned on another comment, yt-dlp works, Depending on how deep you want to go, there's a lot to grab
Telegram, Discord and assorted communities do a lot for keeping some semblance of "stashing" alive
Also there's Whisparr
The "weird" part of it (And why I believe a lot of people don't think about it at first) is the amount of forethought that this involves "The algorithm" plays a significantly larger part on sites where it's considered a faux pas to have an account, and actively curating a collection is considered creepy, unlike with music