noun
pornographic magazine or book sold wrapped in plastic
Slang term from the 1980s–1990s referring to adult magazines or books sealed in plastic wrap, commonly sold in convenience stores and bookstores. The term is now somewhat dated but still recognized.
昔はコンビニでビニ本がよく売られていた。
Back in the day, porn magazines wrapped in plastic were commonly sold at convenience stores.
ビニ本はビニールで包装されているので、立ち読みができなかった。
Since vinyl-bound porn books are sealed in plastic, you couldn't browse them in the store.
アダルト雑誌 is a more formal and general term for adult magazines, without the specific plastic-wrapping connotation.
Abbreviation of ビニール本 (vinyl book), referring to the plastic wrapping used to seal pornographic magazines and books.