WB,
I believe I said something to the effect of: You will have to bring it up, time and again, in order for it to sink in.
Meaning, you may have to say to your wife: I would like to talk about our sex life. If she won't talk, then you say 'I can see you don't want to respond right now, that's okay, I'll ask again tomorrow.' and you do that, repeatedly, until she opens up.
And then the next week when you have something NEW to discuss, you do it again. It is ugly but completely necessary.

Your wife won't talk because she doesn't have to. Eventually you will give up, and she knows this.

Honey