hi thanks for your query testicular pain is caused due 1.trauma 2.infections 3.torsions the information you gave that your boyfriend has to reposition the testis to relieve the pain is a very important.it is called Phren s Sign.it points towards Epididymitis.. other cause can be testicular torsion in which the testicles get twisted and the blood supply is cut off.. in any of the cases kindly refer to a doctor and get the affected area examined.. in the meantime following home care steps may reduce discomfort and swelling: Provide support to the scrotum by wearing an athletic supporter. Apply ice to the scrotum. Take warm baths if there are signs of inflammation. While lying down, place a rolled towel under your scrotum. Try over-the-counter pain relievers, such as acetaminophen or ibuprofen. wishing you good health