What Causes Pain And Discomfort In The Testicles?

I ve noticed that my husbands testicles always sit very high in his scrotum, right up against his body at the base of his penis. Although his scrotum tightens and loosens normally with cold and hot temperatures and arousal, his testicles never move. He doesn t experience any pain or discomfort, the testicles remain outside of his body, and this seems very normal to him. However, my understanding is that the testicles themselves should lower along with the scrotum when they are hot. As it is, his scrotum sags very loose below his testicles and they remain in the up position when he is hot (like right after a shower). Is this normal, or could this be a sign of an issue with his cremaster muscles or the length of his spermatic cords? My husband suffers from severe oligospermia (