Are you talking about talking about the book with your H? If so....talk about what YOU want to talk about. If you want to ask a question about him being an arousal=desire type of person then ask...I've asked my H questions like that....I would however avoid telling him you think he's this, ask him if he feels like that could apply to him.
A HUGE mistake I made was not asking my H the questions that I needed answers to....we wasted a lot of time because I pussy-footed around. My H certainly wasn't going to come to me and suddenly start up a conversation about this big white elephant in our M...so it was up to me.
If he's read the book and you want to talk about it...then do it; he's not likely to start up a conversation like that now is he?