fan service n. a feature, inside joke, or obscure reference included in entertainment primarily to please a core fan group, or a work of entertainment expressly created for that purpose; (hence) in anime and manga, visuals which include nude or semi-nude figures. (source: Double-Tongued Dictionary)
Further reading
Enthusiastic book recommendations! Martha’s savoring the biography of Alexander von Humboldt, the 19th-century explorer, polymath, and naturalist who revolutionized our understanding of nature and predicted the effects of human activity on...
We use the term Milky Way for that glowing arc across the sky. But how people picture it varies from culture to culture. In Sweden, that starry band goes by a name that means “Winter Street,” and in Hawaii, a term for the Milky Way...