Penis gags, sometimes called inflatable gags, are a form of gag used primarily in BDSM scenes. The gag consists of an intrusive, penis-like limb, which primarily blocks tongue and some throat movements. Alone, the gag can be pushed out, but a pump attached to the gag can be used to inflate the limb. Once inflated, the gag becomes impossible to pushed out. When properly attached, it is impossible for the subject to remove or deflate the gag. The penis gag is quite similar in nature to the scold's bridle, and may in fact be a modern representation of the device.