[NSFW] Heat Check Image

Evaporated
Friendship, Art, and Magic (2020) - Took part in the 2020 Community Collab
My Little Pony - 1992 Edition

I’ve been trying to hunt down this old image I knew about, but haven’t had much luck. It was an image that discussed picking a number between 1-100, and depending on the number you got, it described the stage of estrus you would be in. I don’t remember the artist, and I haven’t really been able to figure out the right search terms to hunt down the image.
 
If anyone remembers this, can you link it to me?
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Champions of Equestria

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