"Cum-in-Mouth Porn" refers to a specific type of pornographic content where the act of receiving semen in one's mouth is depicted. This often involves oral sex, either given or received, and typically culminates with the performer(s) ejaculating onto the other person's tongue, inside their mouth, or onto their face which may extend into their mouth. The tag is used to categorize content that includes this act for the purpose of adult viewers who enjoy or are interested in such scenes.