Alright, I'll stop shitposting and spoonfeed a bit. Everything mentioned in this post is completely legal (in the US) and on clearnet.
To find pedo/hebe movies, Rare Film Finder and Sensitive Content are invaluable resources.
RFF is a database of movies with child/teen actors. SC is a database that lets you search those same movies for specific content (seen in those screenshots).
SC has links to RFF for each movie. They used to be the same site, but were split into two so RFF could have a clean and normalfag-friendly facade.
The split makes them less convenient though, for example SC doesn't have any info on genres, so you can't search specifically for action or romance or anything. As a result, you have to search for the content you want, then click through to RFF for each movie to see the genre/synopsis/etc. and see if you'd even like the movie in the first place. Kind of backwards to me.
These sites just have info on the movies though. To actually acquire movies, you'll have to go elsewhere.
For girl movies specifically, First Love Movies is amazing. There's a similar forum or two for boy movies instead but I don't remember what they are and don't know how good they are, because I don't care about boys. FLM will have links.
FLM is home to the best sort of autism. These people will track down movies from all over the world no matter the cost, and make sure they stay constantly available on the internet for 10+ years. They spend countless hours cleaning up shitty VHS rips from the 70s, tracking down 20 different censored versions of a movie and splicing them together to give the most complete version in existence, AI upscaling, etc. I've seen them track down movies that only ever existed on VHS, were only sold for a few months 50 years ago in some little European country, and only had a few thousand copies ever made.
90% of the time when I find a movie on SC/RFF that I might want to watch, no matter how old or obscure it is, FLM has it ready.