Explanation
This is a mnemonic to help you remember the eight carpal bones. Take the first letter of each word: Some Lovers Try Positions That They Can't Handle → S-L-T-P-T-T-C-H, standing for Scaphoid, Lunate, Triquetral, Pisiform, Trapezium, Trapezoid, Capitate, Hamate.
"Sometimes Luna takes pains to treat creatures honorably" is a Harry Potter-themed variant spelling out the exact same eight letters, in the same order.