Well, marriage represents Christ (the groom) and the church (the bride).
I never said there was marriage in heaven, thats another group that thinks that.
Sex by the way is a gift from God.
OK, I'm wandering a bit far afield from the topic now: I don't believe that Marriage "represents" that relationship, in the sense of that being the purpose of Marriage.
Jesus was using Marriage as an analogy for our relationship with God. But Marriage was instituted in order to form societal units, not simply so that centuries later God could reveal that it was a symbol.
I would contrast that with Baptism and the Eucharist, both of which are instituted as symbols of our relationship with God.
I was simply providing the verse I was quoting since you wondered where in the Bible it "said that". Maybe I misunderstood what the "that" was that you were refering to. It did come to my attention that I seriously gunked up my last sentence about love, so that many people thought I was saying that Marriage had nothing to do with love, when what I was saying was that love will remain in heaven and be perfected, while marriage will not.