Some couples choose to stay together because they don't want to disrupt their children's lives.
Some couples merely buy fake divorce papers, without actually going through with it.
For some couples who are very different in age, survivor benefits also come into play.
Dr Hack said snoring could have a devastating effect on relationships, with some couples splitting up because of it.
Coontz notes some couples even choose not to marry in order to reassure adult children that they'll get their inheritances.
And they might even encourage some couples to have more children.
Indeed, some couples, when faced with the ruinous financial consequences of divorce during a downturn, may decide it's cheaper to seek counseling and give it another go.
As a surrogate in the UK, it is illegal for Miss Broomhall to receive payment, although some couples have offered her large sums of money to carry their child.
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Indeed, divorce attorneys, therapists and real-estate brokers say renovations bring differences between couples to a head, and by the time the remodel is completed, some couples decide to call it quits.
Ron and Judy Pekny of Worldwide Marriage Encounter say the title of "longest married couple" is based on nominations the group received, so there may be some couples who have been married longer.
Anecdotal evidence shows that some couples who initially struggle to conceive and have a child by IVF or adoption, later fall pregnant naturally - possibly because the stress of the situation has been lifted.
As a recent article from Reuters explains, some couples who have the opportunity to have a second child still choose only to have one as the costs of living and education are so substantial.
When it comes to getting hitched, some couples want to have a wedding for the sake of showing their commitment to friends and family, regardless of whether it will be legally recognized where they live, she said.
Here's a beaut: The new law allows some couples to redeem EE savings bonds issued after 1989 and defer some or all taxes if the proceeds are rolled into a state college savings or prepaid tuition plan.
While divorce is perhaps most appropriately a private matter, some couples do make very public headlines when they split, and for those of us in the business of helping people through divorce, these newsmakers often provide useful cautionary tales.
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The last time the surtax was around, some couples tried to plan around it by having some assets taxed in the estate of the first spouse to die and some taxed in the estate of the second spouse to die, says Kaufman.
In some instances couples are using them essentially to update their prenups.
More than that, some gay couples who wed in Hawaii will return to their states to begin court battles for recognition of their now legal unions.
For some families and couples Christmas can, by contrast, be a bonding experience.
While country music played gently in the background and sheriff's deputies watched from the wings, two clerks asked the couples some innocent but awkward questions and logged addresses, phone numbers and relatives' names on a computer.
But as gay couples campaign to get some of these rights, unmarried heterosexual couples are gaining a new option, too: domestic partner registries.
The sticking power of well-to-do couples puzzles some sociologists and economists, whose theories predict the opposite outcome.
In 2001, a bill was signed which offered some relief for married couples.
There are some key similarities: couples need to give public notice of their intention to partner in the same way as a man and woman who are marrying.
BBC: Germany introduced similar equality legislation in 2001
It's a good idea for some, but most couples don't have a lot of assets to worry about at the start, and many a moony-eyed pair think there's something unromantic about beginning a lifelong commitment with a financial document drafted by lawyers.
To determine which couples landed on the list, we looked at both Web presence and press clippings for more than 50 A-list couples--some still together, some not--over the course of the last year.
Though formal arranged marriages were banned in 1950, parents and colleagues continued well into the new century to help couples pair up (some still do).
Gay rights advocates in Argentina later argued that civil unions, allowed in a several states, were a positive step that conferred some benefits to same-sex couples, but didn't go far enough.
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