Responses
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This is a search page for smut. I removed the Yaoi, Shounen ai, and the webtoon genres so you should be getting only smut manga. hope it helps.
https://www.mangago.zone/genre/Smut,Mature/?f=1&o=1&e=Yaoi,Shounen%20Ai,Webtoons
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This is the same list but sorted by latest update in case you wanted the more recent stuff first
https://www.mangago.zone/genre/Smut,Mature/?f=1&o=1&sortby=update_date&e=Yaoi,Shounen%20Ai,Webtoons
Hm! Can you help me find some japanese r19 straight manga