I don't think I would have for a first marriage, but if one or both parties had children from a first marriage I would feel differently on the second one. I would want any assets prior to a later marriage to go to my children. It is a very complicated issue.
We have a situation brewing in our family. A relative is about to marry a woman who has proven herself over the past few years to be a pushy, greedy, manipulative gold digger. Relative in question was married before, with two daughters - one recently graduated from college and is working. The second daughter worked for a year or two and is now entering college full time. The fiancee also has a daughter of 28...no money, no job, no desire to look for one, no morals either. She's got a 4 month old daughter - father unknown, because the mom was sleeping around with multiple guys (put baby's health in jeopardy with the assortment of STD's she collected along the way)
The fiancee has making moves on relative's assets including the house that was intended for his daughters, and now she's got her sights set on installing her deadbeat daughter in her potential in-laws basement apartment. She had tried that stunt before - trying to engineer things so that another young family member who was renting said apartment - so that he'd be forced out so her daughter could move in). The trail of underhanded schemes is long!
Anyhow, she apparently brought up the prenup in such a way that was guaranteed to make the guy feel really guilty about "not trusting her" and "building a life together" etc. If he actually signs a prenup I'll be very shocked!
The only person on the planet that hasn't figured out he, his daughters and possibly his parents are about to be shafted is HIM! Sad...but I'm praying he'll sign the prenup or better yet, not marry the woman at all.