TS, how was your husband's bedroom performance in the past?
Did he enjoy sex or did he face some problems with intercourse?
How long has he been addicted to porn?
(These are private questions; you may keep the answers to yourself.)

FYI, sometimes, men avoid sex because they don't want their women to find out their impotence or erectile dysfunction. This may be why he's addicted to porn because it's a form of "physical exercise" for him, or it may be because porn addiction causes him to be even more dysfunctional.