When a guy, after ejaculating, goes and pees to get the rest of the sperm out of his urethra, rather than have sticky semen continue to spurt out in aftershocks. This is a tried and tested method for preventing a sticky mess (other than the one already created).
Melanie: Do you want to go to the bathroom before we have sex, honey?
James: No, I want to save it up so I can clear the canal afterwards.
Jason stood under the falling water, waiting to be able to pee after jerking off. Clearing the canal sometimes took time, especially when he peed his bladder out before taking his shower.