How sad for your wife.That is gonna get old and BORING fast. No wonder its not amazing. It became as predictable as washing dishes. I don't think you're having sex, you're masturbating using her body.
Well its not always like that. Sometimes we have sex in the day time. However I do prefer order and structure. I like to know in advance we are going to have sex. I like predictable things. I'm an iSTJ!