Luke 20:34-36: (King James Version)
34 And Jesus answering said unto them, The children of this world marry, and are given in marriage:
35 But they which shall be accounted worthy to obtain that world, and the resurrection from the dead, neither marry, nor are given in marriage:
36 Neither can they die any more: for they are equal unto the angels; and are the children of God, being the children of the resurrection..

Apparently, anyone that gets married in this life isn't getting into heaven.
hackthemainframe says since it says several times elsewhere int he bible that its ok for people to get married, most have interpreted that passage as meaning that in heaven, no one will be married as everyone will love everyone equally

I guess that's another way to look at it.