Obsessed over wife/wife's body

I am married to my high school sweetheart. We are deeply in love but over the years I have become addicted to taking nude pictures of her, I never seem to get tired. I take pictures when she is asleep, when she is taking a shower, when we are having sex, i take pictures of her vagina, I take pictures of anything to do with her, if she is naked and i have camera handy, i will take a picture. I can spend hours on end just looking at this pictures. I have no desire to share these pictures with anyone, indeed, i have never shared any. She knows I take these pictures and sometimes we look at them together. She says I am not insane, that i am just deeply, madly in love with her and she does not want me bothering myself. My question - am I insane? Am I on the path to insanity? Is this some kind of dangerous obsession?