Oral sex ?

My boyfriend and I had sex last night and he went down on me. I had just showered, so I felt clean down there. After we had sex, he told me that it tasted bad down there and he didn't like it. He said it was different than any other times. What caused it to taste bad even though I just showered? I don't understand why it was bad. Has this ever happened to anyone else? Is it normal? 

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