The term forniphilic gag comes from the term forniphilia which describes the type of bondage related to human furniture.
More About Forniphilic Gag
A forniphilic gag is generally used in conjunction with ropes or cuffs which are used to bind the submissive's hands behind their back. Without control of their hands, the submissive must use the gag to control their tool and complete their assigned task to the dom’s satisfaction. They might be asked to act as a human ashtray, dust the furniture, or sexually pleasure the dom or another submissive, depending on the tool attached to the gag.
A forniphilic gag looks to objectify and/or humiliate the person wearing it. This helps reinforce the individual’s position as a submissive participant in BDSM play.
Due to the nature of forniphilic gags, they can become contaminated with germs. While all gags should be cleaned after every session, extra care should be taken if these gags are used in spaces such as the bathroom.