A type of sensation play involving the use of small glass or plastic cups which are placed over the skin and then evacuated to create a vacuum, and hence suction. Some cups have an integrated valve to which a hand-operated vacuum pump can be attached; in other cases, the vacuum is created by dropping a flaming cotton ball, usually soaked in alcohol, into the cup and then placing the cup over the skin in such a way as to extinguish the flame. The vacuum is created by the contraction of the cooling air.