Do I have green teeth?

I'll keep this short. That's easy because I don't understand it well enough to have anything to say.

Yesterday morning as Wife and I woke up, I wanted to fuck and so I really tried to interest her as slowly and attentively as I could: shoulder rubs, gentle kisses, lightly stroking her hair and arms ... the works. Absolutely no response. Not the slightest interest. She didn't even roll over a bit to make it easier, which she used to do (sometimes) if she felt like going along. So I sighed and got up to make some coffee and putter about.

When I cam back to the bedroom maybe a half an hour later, her legs were spread wide and her vibrator was deep inside her. She was sopping wet and totally engrossed.

Well, I'll skip the rest of the morning because this is a blog about my marriage and not a porn site. But I don't understand. At first I thought she just wasn't in the mood. But obviously she was just as horny as I was, or she wouldn't have reached for her vibrator as soon as I was out of sight. All the same, as long as I was the one carressing her, she wouldn't let herself betray any hint of interest.

So I am left with the question: Am I that repulsive? Do I have green teeth, or what?