Hentai-Vostfr is a specific type of adult content. "Hentai" refers to Japanese animated adult material, often involving fantastical themes and exaggerated characters. It usually features anime or manga-style art. "Vostfr" is an abbreviation for "version française," meaning it has French audio or subtitles. So this tag indicates a French version of a hentai video, which could be either dubbed in French or have French subtitles over the original Japanese audio. The content will still primarily showcase anime-style adult animation.