AITA for refusing to let my husband take lingerie and nude photos of me to show others online?

I want to keep things personal and private but he's obsessed with showing me off and talking about me to other people. He says it's his one major kink, we've talked about how uncomfortable I am with it and doesn't seem to phase him at all. It's been nearly 2 weeks straight of nothing but that conversation.
I mean what do I do? We've been together 18 years, I don't want the relationship to end but neither of us willing to compromise on this and feel like crying and ripping my hair out over it.