When you try to talk to your husband about wanting to be intimate more and he just shuts down. Says things like "oh stop it" or just brushes it aside.?

I've tried over and over to open up and talk and he just basically rolls over and goes to bed.

Are we just supposed to live like this ? We've been together for almost 16 years. We try to spice things up once in a while but it's the lack of intimacy that's the issue. I want to feel desired, wanted, sexy. I want to know I still do it for him. Just to feel close to him. Even when we are intimate it's over within five minutes. And it seems like he just wants to get it over with as soon as possible.

Do you think he's just checked out?