https://www.thegospelcoalition.org/blogs/scotty-smith/article-is-there-sex-in-heaven/
Much of Christianity has an anti-sex obsession just like it has an obsession with torturing people in Hell eternally. However, have people really examined the Bible to see what it really says?
Everything on earth is analogous to something in Heaven. Heaven neither simply removes nor simply continues earthly things. If we apply this principle to sexual intercourse, we get the conclusion that intercourse on earth is a shadow or symbol of intercourse in Heaven. Could we speculate about what that could be?
It could certainly be spiritual intercourse–and, remember, that includes sexual intercourse because sex is spiritual. This spiritual intercourse would mean something more specific than universal charity. It would be special communion with the sexually complementary; something a man can have only with a woman and a woman only with a man. We are made complete by such union: “It is not good that the man should be alone.”[25] And God does not simply rip up His design for human fulfillment.
The relationship need not be confined to one in Heaven. Monogamy is for Earth. On Earth, our bodies are private.[26] In Heaven, we share each other’s secrets without shame, and voluntarily.[27] In the Communion of Saints, promiscuity of spirit is a virtue.
The relationship may not extend to all persons of the opposite sex, at least not in the same way or degree. If it did extend to all, it would treat each differently simply because each is different-sexually as well as in other ways. I think there must be some special “kindred souls” in Heaven that we are designed to feel a special sexual love for. That would be the Heavenly solution to the earthly riddle of why in the world John falls for Mary, of all people, and not for Jane, and why romantic lovers feel their love is fated, “in the stars”, “made in Heaven”.[28]
http://www.isawthelightministries.com/polygamy.html
The Bible is full of God-approved polygamy. Why might it be a good thing:
Men are Naturally Polygamous
We know that when men are stuck in a traditional western marriage of only one woman, that many times he will cheat behind his wife’s back. To be realistic, most men would cheat on their wife if given the opportunity, if he felt very confident that his wife would never find out. God created men with very intense, natural sexual desires that are very difficult to control, especially with all of these women walking around in very short skirts/shorts and showing much of their breasts.
74% of men say they would have an affair if they knew they would never get caught. Source: Associated Press, Journal of Marital and Family Therapy. Date research was conducted: September 7, 2016. The same study said 57% of men admit to have already committed infidelity in a relationship. But the truth is, the same study said that 74% of men would cheat if they knew they would never be caught, therefore the other 17% are lying. This is confirmed by a study conducted in India, which says that 75% of all men cheat on their wife. Source
Of course, just because 75% of men are having sex with multiple women doesn’t prove that it’s the will of God. But nevertheless, it does prove the natural instinct of men. Most men desire to be with more than one woman. That’s not because of the devil but rather because God created men to have a very powerful sex drive. But most women want to be with only one man. These natural differences were created by God.