Maybe this is a great opportunity for you to take the hint from her and chill out, relax and have some fun.
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Now-- she knows me well enough to know that I was just kidding
Really? So that explains why she didn't tell you about it. She didn't tell you because she knew you'd 'disapprove' - and as it turns out - you do! You're not her father! or the morality police ! You're her lover....
It's actually quite sad, that a wife doesn't feel safe enough with her H to have a good joke about how she and the girls are getting a male stripper over to spice up, in a totally non-threatening way, a girls-night-in. Sadly your over reaction to it, demonstrates why she didn't tell you and then felt she had to 'bury' the evidence.
As for getting the images out of your head - you could use the thought stopping techniques advocated here for people who obsess about their partner having affairs. The most popular one is that you visualise a STOP sign every time the image pops into your mind. Alternatively you could put a rubber band around your wrist and flick it every time you think about the photos.
Loosen up. Help let your wife know you approve of her and her choices - you might be in for a pleasant surprise.
V
Never make someone a priority, who makes you an option.