Happy,
I'm in the group with questions. How do you know that your wife is having multiple orgasms while going down on you? And are you doing something to stimulate said orgasms? Has she told you she's having orgasms or are you just assuming it from some physical reaction?
You say she goes crazy when you watch porn with MFM or more, in what way does she go crazy? And if she gets that wild and crazy when you watch said porn, then why don't you try doing that more to wake up your dead sex life? It sounds like you know what works for her, but you want something more.