Gokkun is a Japanese term borrowed directly into hentai tagging for scenes centered on swallowing semen, frequently collected from multiple partners beforehand in a bukkake-adjacent setup before being consumed. It's tagged as its own distinct act rather than folded into general oral content, since the swallowing itself, rather than the act leading up to it, is the focus. The term has become widely recognized shorthand in doujinshi circles well beyond Japan. Fans searching for gokkun hentai doujinshi can find this category represented in Top Hentai's library.