A curiosity often crops up in the early stages of a relationship that makes you wonder about your partner's past--what was their last relationship like? Why did it end? How many relationships have they been in?
While I think such talks have the potential to strengthen a relationship (opening up to one another and growing together from past mistakes), I also am of the mind that what's in the past is in the past and there's no need to discuss details.
What can also irk me is if an ex is brought up too soon and too often.
What about you? When is it appropriate to open up the "ex-files?" Do you feel it's a discussion to have or something to keep in the past? Have you ever been on a date with someone who talked too much about his or her ex?