Well, this is disturbing... Bing's ML image generator will generate male politician video game character portraits no problem, but change the word "male" to "female" and it gives a content warning and blocks the request.
Interesting. If I do not specify the age/race of the character to be generated, it then allows it. I removed the terms "caucasian" and "middle-aged" to get past the block.
Okay, I think I found the formula. If you include any racial indicators (i.e. "African American", "Caucasian", "Latino") and you include the word "Female", it blocks the request.
How bizarre.
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But it does allow more descriptive terms, like "dark-skinned"...
