I've been inspired to make this list by a visit to some friends today - it's a first draft of the natural progression of questions through life....I'd like to make it more complete, so please comment to add other stock questions.....
You're single: When you're going to get a girlfriend?
You've got a girlfriend: When you guys getting married?
You're married: When you going to have children?
You're pregnant: Are you pregnant?
You've got a child: When you going to have another?
You've got two children: Are you going to have more?