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Considering human nature, and the very reason why Solomon had so many wives (it certainly wasn't for politics), it seems exceedingly likely that he had group sex on a regular basis. Moreover, since God seemingly had no qualm with Solomon's massive sexual drive, why would he not create some sort of sensual afterlife, too?
1 Kings 3
1 Now Solomon made a treaty with Pharaoh king of Egypt, and married Pharaoh’s daughter; then he brought her to the City of David until he had finished building his own house, and the house of the LORD, and the wall all around Jerusalem
Of course Solomon married for political reasons he took many foreign wives from the kingdoms around Israel for political purpose.
But as for Gods relationship with Solomon in the end it was not good Solomon’s foreign wives had a detrimental affect on his relationship and faith in God.
1 Kings 11
1 But King Solomon loved many foreign women, as well as the daughter of Pharaoh: women of the Moabites, Ammonites, Edomites, Sidonians, and Hittites— 2 from the nations of whom the LORD had said to the children of Israel, “You shall not intermarry with them, nor they with you. Surely they will turn away your hearts after their gods.” Solomon clung to these in love. 3 And he had seven hundred wives, princesses, and three hundred concubines; and his wives turned away his heart. 4 For it was so, when Solomon was old, that his wives turned his heart after other gods; and his heart was not loyal to the LORD his God, as was the heart of his father David. 5 For Solomon went after Ashtoreth the goddess of the Sidonians, and after Milcom the abomination of the Ammonites. 6 Solomon did evil in the sight of the LORD, and did not fully follow the LORD, as did his father David. 7 Then Solomon built a high place for Chemosh the abomination of Moab, on the hill that is east of Jerusalem, and for Molech the abomination of the people of Ammon. 8 And he did likewise for all his foreign wives, who burned incense and sacrificed to their gods.
Bad things happen when you let woman go to your head, LOL Poor Solomon the wisest man the world has ever seen but in the end his wisdom did not prevent his fall.
All Praise The Ancient Of Days