My ex is a urologist. Reversing vasectomies have a better results the sooner the reversal takes place as scar tissue can form and prevent a successful reversal. It also depends on how the vasectomy was done as to whether or not it can be reversed, as there are a couple of different ways of doing them. Having one does not prevent men from continuing to produce sperm. Also have to make sure after the procedure that there are no stray swimmers and that the procedure worked. Ex had a patient who didn't come back for 2nd recheck after the first showed he still had swimmers. He came back after the wife got pregnant. 
He was not only a lawyer but someone we went to church with and knew well. Fortunatley - for everyone - he still had swimmers.
As "Toots" was, and I repeat, was, a little on the petite side, after we had our second, the Doc was in there anyway and we had her tubes tied. She had a history of, er, female problems, we were blessed to have two kids, a boy and a girl. As we were very young, I didn't see how we could afford any more than that anyway!
Gotta tell ya, now, I wish we would have had two more, just for the opportunity to out reproduce the asshats who hate America and are infecting our civilization!
My kids are hardcore red blooded patriots! Hell, my granddaughter shot her first deer last year at the ripe old age of 13! Papa has never been more proud of his "Stinker"!
