Your wife is not being unreasonable for being a bit irked about it. The only explaination I can come up with is to tell your wife that it would be easier for your ex to ask you (someone she knows well) for the nude pics, instead of some stranger.
But really, she could have gone to some website to get a nude pic of a guy. Is it totally wrong to assume that this ex-gf may still have feelings for you?
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