External Catheters, also commonly referred to as condom catheters or male catheters, are used by men to treat urinary incontinence. This type of catheter consists of a flexible sheath that slides over the penis just like a condom. Many men find external catheters to be a great alternative to more invasive catheters, such as indwelling catheters that require insertion through the urethra. In addition to being a great alternative, the condom catheter is incredibly easy and straightforward to use, since it is simply rolled onto the penis. Generally speaking, an external catheter affixes to the penis by an adhesive.