OK. Here is the story.
King David was old and stricken in years; and they covered him with clothes, but
he gat no heat. Wherefore his servants said unto him,
Let there be sought for my lord the king a young virgin: and let her stand before the king, and let her cherish him, and let her lie in thy bosom, that my lord the king may get heat.-1 Kings 1:1-2
But King David died anyway. And his son Solomon had some people killed and became king in his own right, but he overtaxed the JOOS. You remember him. He settled the quarrel when two women both claimed to be the mother of the same boy, talked to God personally (twice), played with the Queen of Sheba and had the kingship of Israel sewn up forever. He was GOD's pal.
Until he desported himself in the company of 700 concubines and started forgetting the LORD's rules. Eventually he died of overindulgence. At this time, you must get your Bible and read 1 Kings 11.
All done? Ok. Now the JOOS are looking for a new king and we go to 1 Kings 12. Reboham, Solomon's son was made King of Israel (meaning the tribes of Israel) and the people said to him that the burden placed on them by Solomon had been excessive, and that if he would cut them some slack, they would follow him. Reboham's advisers told him to tell the people that "
My little finger shall be thicker than my father's loins." ,meaning that he wouldn't tax them excessively to pay for all those concubines and they would be his subjects.
But Reboham didn't listen to his advisers. He told the elders that instead of whipping them if the didnt pay, he would torture them with scorpions. Then he sent the tax man on a booty call. So the tribes of Israel, except the tribe of Judah, killed the tax man and rebelled against the house of David. They called upon Jeroboam the son of Nebat to be their king.
Well, eventually, GOD stepped in and smited Jeroboam and his house and gave the JOOs back to Reboham as slaves.
Golly, it's just a WONDERFUL story! Doesn't have anything to do with Solomons loins, though. It was just a metaphor or a simile or a synechdochic or an allegory. Or maybe it was pataphor or tertium comparationis or a conceptual blending. Who knows? JOOS talked funny in those days.