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In the first 30 seasons of "The Simpsons", there is not a single season with more female guest stars playing themselves than male ones. Well, there was one draw as no guest stars appeared in the first season...

A butterfly bar chart with two sets of mirrored bars for each season of "The Simpsons" showing the number of female (left, yellow) and male (right, light-blue) guest star appearances in the first 30 seasons.
Number of guest stars in "The Simpsons" appearing in seasons 1-30 as himself or herself, aggregated per season.
The title is the name of a fictional educational film shown in "The Italian Bob" (S17E08).
Chart: Cédric SchererSource: WikipediaGet the dataCreated with Datawrapper