In the Bible it says that there will be a "new heaven and a new earth"; and from this, I get the impression that people don't really go to "Heaven" in the very common way that Christians like to think.
Exactly. Where did that harp in the clouds idea come from anyway? Yes we will live on a new earth!
It is just my personal interpretation, which could very well be wrong, that after we die we will have a "second chance" in this "new earth", but the really great things about it is that there will be no sin, and we will be able to have a closer relationship with God. We will still be human, we will still have free will, but because there will be no sin, and we have THIS life to learn from...we will have no desire to do evil...even with free will.
Can you imagine, standing there watching the first dawn of a new creation, knowing that this time it'll evolve GOD'S WAY!?!
With that being "said", it is very possible that there will still be men, still be women; we will still have the capacity to fall in love and get married. The difference is that, again, because there will be no sin, our thoughts and actions will be more pure...like it was meant to be in the beginning. The sanctity of marriage will have a much stronger meaning.