Massager for the body cavities and methods for using the same

A device for massaging a human body cavity, comprising:

• a substantially cylindrical shaft having a length and a diameter configured to fit inside the human body cavity,
• wherein the outer surface of said shaft has a curvature that roughly fits within an auxiliary circle,
• wherein a cross-sectional profile of the outer surface has at least a first portion and a second portion,
• wherein the first portion has a first point and a second point, and a distance to a center of the auxiliary circle decreases between the first point and the second point of the first portion,
• wherein the second portion has a first point and a second point, and a distance to the center of the auxiliary circle increases between the first point and the second point of the second portion, and
• wherein the lengths of the first and second portions of the outer surface can be different.