Body worn urinal comprises a liquid proof bag provided with a urine outlet and an entrance opening having a size to allow entrance of at least a penis of a user into the liquid proof bag. The body worn urinal also comprises adjustable fastening means to releasably fasten the body worn urinal to the user. The liquid proof bag is sized to hold in use at least the penis as well as the scrotum of the user. In use the penis and scrotum are moved through the entrance opening into the liquid proof bag, wherein the adjustable fastening means are located at least near the entrance opening of the liquid proof bag. By means of the adjustable fastening means the size of the entrance opening is reduced to prevent removal of the liquid proof bag from the penis and scrotum.