Flagging is a way of communicating basic information without needing to speak. Bandanas are soft introductions. They are self-labelling devices, material imbued with meaning, intended to provide enough information for cruising parties to determine the likelihood of an erotic match. In many cases, they provide a way of making an initial connection. Like any system of underground communication, it is community specific, and does not travel well. Where do you wear them and what does that mean? Subcultural meaning stays local.