a tubular prophylactic device and method is disclosed which provides for frictional stimulation of the male penis during copulation while simultaneously serving as an impermeable barrier for the prevention of disease and for birth control purposes . in one form the device consists of a pleated collapsible tube with an extended length from the open end to the closed end of at least approximately twice the length of the erect mature human male penis . the additional length allows the penis to move relative to the prophylactic device during copulation , with the prophylactic device remaining stationary with respect to the wall of the female vagina . in another form the device is characterized by an inwardly folded sleeve that engages the penis and provides for sealing and an excess length that allows for movement of the end of the penis relative to the device when in use . the method is characterized by relative movement between the glans of the penis and the membrane of the device during use thereof .