Husband always drinks to have sex

My husband has really low drive the last few years and even says he doesn't have interest in sex anymore. After Dr's visits and stuff they all say he's fine (no ED and no hormone /testosterone issue) . So I assume its me. He gets defensive about the subject and it's embarrassed and mad when I ask if it's me. He won't really open up when I try to talk about it. We don't have sex alot maybe like 10 times a year or less. Lately the past 3 or 4 times he has whiskey first then has sex with me. Like I'll hint all day about wanting sex and he'll be like OK sure and have drinks first he won't have sex without drinking now. He never drinks only a few times a year and has neve rhad a drinking problem or anything. I think he's unattracted to me and drinks to get through the sex he doesn't want to have but when I ask him or mention taht he gets mad and shuts down. What do u think