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- Please note that you should always sterilize the head of the penis and the tube itself with iodine if not already sterile. Furthermore, you should only use individual packets of lubricant since a bulk tube will not remain sterile after repeated use. I contracted a very severe infection as a result. Also, please don't hesitate to contact a urologist about using proper urinary catheters. They may well write a prescription for you and provide instructions. Stay safe and have fun.
