A recent report shows that couples who cohabit before marriage are likely to end up with broken marriages. Accepting the facts, it is important not to be drawn into unwarranted conclusions. A factual correlation does not necessarily imply a cause and effect connection; the related facts can as well be twin effects of a single cause.
It would therefore be very unwise to assert, as though it were established certainty, that if you jump the gun it will all end in tears - the sad end being a natural consequence of the bad beginning.
The facts can as well be interpreted as showing that some people take marriage less seriously than they should. They hop into bed, and then into the divorce court, more precipitately than they should - hasty on both occasions.
Many stable marriages that I have observed among my friends, and indeed have experienced myself, have been preceded by cohabitation in one form or another. Sensible people do not cohabit lightly and do not divorce lightly either.