We had a son (4) and a daughter (2) and my wife really wanted a third. I wasn't that excited about the idea, because we had 2 children and one of each seemed like plenty.
I was a pretty firm "no" for a long time, but she eventually convinced me during a particularly hot and heavy night.
Our youngest is now 10 and she's an absolute joy. I can't imagine my life feeling complete without all 3 kids. It's one of the greatest things she ever conned me into doing.
Then I got a vasectomy.
List is hella whack