My relationship is the opposite (I'm the AS female with an NT male), but I can tell you that I, too seem to have a lack of emotion and lack of desire in the eyes of my husband. However, it's not true; I do have emotions (granted, they're usually sad/anxious/angry), and I do have desire (although probably less than my husband). However, I am terrible at communicating them. He says I don't seem "into it" and gets upset. Then I get upset because I am, but he won't believe me. Apparently my facial expressions contradict my feelings.