well, here are all the ones i'm aware
for western art and stories mainly, huge but extremely frustrating to search through>pixiv and nijie
japanese art sites with a few korean and chinese artists and writers, need to know a little japanese>exhentai and nhentai
for pirated hentai, doujins, galleries, etc>nyaa
has torrents for lots of videos and things you can't find elsewhere>4chan
/s/, /d/, /aco/, /trash/ and sometimes /gif/ have regular preg threads, just search the catalog>2chan
they have gigantic pregnancy and belly editing threads every week>imagefapPost too long. Click here to view the full text.