A device for vibration stimulation in a body cavity of a mammalian subject, the device comprising: an expandable stimulation member (12, 22) being arrangeable in a first state, in which the stimulation member is introducible into a body cavity of the subject, and a second state, in which the stimulation member is expanded, by means of a flow of pressurized fluid to the stimulation member, to a volume such that an outer surface of the stimulation member is adapted to abut against body tissue in the body cavity and to impart vibrations to body tissue in the body cavity of the mammalian subject, wherein the stimulation member constitutes a fluid tight chamber so as to prevent leakage of fluid into the body cavity; a vibration generator (10, 20); and a vibration controller (14, 24) adapted to control the vibration generator to bring the stimulation member to vibrate according to a vibration pattern; wherein the vibration pattern comprises a main periodic element of a first frequency and an excitation stimulus of a second frequency higher than the first frequency; wherein the vibrations are generated by means of one or more of: an electroactive material, wherein the stimulation member comprises said electroactive material, controlled such that the stimulation member vibrates according to the vibration pattern; and the vibration generator comprising a frequency regulating module (17, 26, 27) adapted to provide vibrations according to the vibration pattern to the pressurized fluid in the stimulation member. an expandable stimulation member (12, 22) being arrangeable in a first state, in which the stimulation member is introducible into a body cavity of the subject, and a second state, in which the stimulation member is expanded, by means of a flow of pressurized fluid to the stimulation member, to a volume such that an outer surface of the stimulation member is adapted to abut against body tissue in the body cavity and to impart vibrations to body tissue in the body cavity of the mammalian subject, wherein the stimulation member constitutes a fluid tight chamber so as to prevent leakage of fluid into the body cavity; a vibration generator (10, 20); and a vibration controller (14, 24) adapted to control the vibration generator to bring the stimulation member to vibrate according to a vibration pattern; wherein the vibration pattern comprises a main periodic element of a first frequency and an excitation stimulus of a second frequency higher than the first frequency; wherein the vibrations are generated by means of one or more of: an electroactive material, wherein the stimulation member comprises said electroactive material, controlled such that the stimulation member vibrates according to the vibration pattern; and the vibration generator comprising a frequency regulating module (17, 26, 27) adapted to provide vibrations according to the vibration pattern to the pressurized fluid in the stimulation member. an electroactive material, wherein the stimulation member comprises said electroactive material, controlled such that the stimulation member vibrates according to the vibration pattern; and the vibration generator comprising a frequency regulating module (17, 26, 27) adapted to provide vibrations according to the vibration pattern to the pressurized fluid in the stimulation member.