I believe given enough time your body(Nature made) wants to heal itself, sometimes quickly sometimes it can take years if you allow it to, if it was not for this, you would not find a docter or medical aid anywhere, I wish my car could fix itself( F man made).
Vacectomy:Sperm is still manufactured.
"Vasectomy is minor surgery to block sperm from reaching the semen that is ejaculated from the penis. Semen still exists, but it has no sperm in it. After a vasectomy the testes still make sperm, but they are soaked up by the body."
I am not sure if its soaked up by your body how it can get out, maybe sweating-?