thanks for your querytesticular pain
is caused due
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
wishing you good health