The saline may migrate into the penis, foreskin, perineum, or pubic area. There is nothing one can do to make it go away, it does as it chooses and it goes where it wants. The infusion site may continue to leak. These are all to be expected. I always suggest loose pants so that they can feel the modification for as long as possible.
Diapers are an option, if needed.
Occasionally something can go wrong and I always want to be prepared. I have had someone get lightheaded and feel faint. They didn't eat shortly before the procedure, as I had suggested. One has to be careful with the catheter as it is plastic and can break, no one wants to have to go the emergency room to have a piece of plastic removed from their scrotum. Other than the subject that hadn't eaten, my experiences have all been positive.