Permature ejaculation

My husband recently just turned 30 and for the past 2 years his time just keeps going down. Now he last under a minute, He feels really bad but he doesn’t know how to deal with it. I thought maybe it was because he doesn’t masterbate, so I suggested he start jacking off and maybe that’ll help. I asked him to make an appointment but he won’t do it out of embarrassment, idk what to do half the time I’ll let him do his thing but it’s frustrating when your partner gets to finish off and you don’t. I don’t ever talk down to him or turn him down but it’s starting to really bother me. I’m trying to find solutions, has anyone dealt with this ?