"stroke book" meaning in English

{
  "forms": [
    {
      "form": "stroke books",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "stroke book (plural stroke books)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1993, Stephen King, Nightmares & Dreamscapes:",
          "text": "The stained mattress on the floor was littered with stroke-books and the walls were papered with photographs of women who appeared to be wearing nothing but a thin coating of Wesson Oil.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A pornographic book or magazine."
      ],
      "id": "en-stroke_book-en-noun-d9u8othC",
      "links": [
        [
          "pornographic",
          "pornographic"
        ],
        [
          "book",
          "book"
        ],
        [
          "magazine",
          "magazine"
        ]
      ],
      "raw_glosses": [
        "(slang) A pornographic book or magazine."
      ],
      "tags": [
        "slang"
      ]
    }
  ],
  "word": "stroke book"
}

{
  "forms": [
    {
      "form": "stroke books",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "stroke book (plural stroke books)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English slang",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "1993, Stephen King, Nightmares & Dreamscapes:",
          "text": "The stained mattress on the floor was littered with stroke-books and the walls were papered with photographs of women who appeared to be wearing nothing but a thin coating of Wesson Oil.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A pornographic book or magazine."
      ],
      "links": [
        [
          "pornographic",
          "pornographic"
        ],
        [
          "book",
          "book"
        ],
        [
          "magazine",
          "magazine"
        ]
      ],
      "raw_glosses": [
        "(slang) A pornographic book or magazine."
      ],
      "tags": [
        "slang"
      ]
    }
  ],
  "word": "stroke book"
}