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Heaven is for God's glory. It isn't like earth without pain. It's a place of eternally singing praises to the Most High. Human relations are not necessary to glorify God; hence there are no marriages in heaven (Luke 20). In my opinion, we won't desire sex in heaven either, because our time will be filled with praising our Redeemer.
We need to respond to the purpose of sex: 1. Procreation. Filling the earth. In heaven there's no need of procreation in this manner any more. 2. Fleshy need. Mostly it is to meet the desire of the flesh. In heaven we will have glorified bodies. 3. Worship. You honour the marriage bed hence worship comes forth. In heaven we will be in a perfect state of fellowship and worship.
When Jesus was questioned in Luke 20:27-40 about the case of a woman who had been married in turn to seven brothers who had each died without having children with her, He was asked which of the seven she would be married to in the resurrection. (The question was hypocritical on its face, since the Sadducees who posed it to Him did not believe in the resurrection (as noted in Luke 20:27). They were merely trying to trap Jesus into saying something that they could use to bring a charge against Him for contradicting either the Mosaic Law or their own beliefs or traditions.) Jesus responded by saying that those who would attain eternal life would neither marry nor be given in marriage in the age to come, but would be like the angels. Since marriage is the only condition under which the Bible allows sexual relations between a man and a woman in this life, this says to me that there will also no longer be sexual activity among the redeemed in eternity. They will all be like Christ, whom the Bible does not record as having married during His earthly life, and thus also never having engaged in sexual relations. (In fact, Jesus would never have even looked at a woman only from a standpoint of sexual attraction. If He had done so, He would have violated the standard that He Himself articulated in the Sermon in the Mount (Matthew 5:27-28).) From a practical standpoint, there would also be no need of sex for the purpose of reproduction (since the entire number of the redeemed would already have been determined and fixed), and no need of it for the purpose of physical pleasure, since the redeemed will already have attained the greatest joy that it is possible to achieve by being in the presence of God Himself for eternity, of which any godly joy or pleasure that is achievable or attainable on this earth or in this life (even the physical pleasure of sexual relations within marriage) is but a pale shadow.
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