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A fictional plot device used in poorly-written erotica to explain why a character in a sex story that's the Ice Queen one minute is suddenly, unexpectedly an out-of-control nymphomaniac the next. The term "gay ray" for male-on-male stories is analogous. The expression that some character must have been "hit by a Martian slut ray" is usually pejorative, and infers the sudden transition is somehow an unforgivable hole in the plot for which the author(s) must be slut-shamed at once.
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