I know a couple that didn't agree - he wanted 2 and she wanted 4!! They were at an impasse but then had an oops baby, and now they have 3 kids. She's come around and doesn't want a 4th, plus he went ahead and got a vasectomy after baby #3 was born.

Bee and I were lucky in that we both wanted 2 kids. If she had insisted on 3, then maybe I would have come around over time? But our family of 2 kids feels pretty complete to me.