Lucifer_The_Dark: good question! We hadn't considered that one. Off the top of my head, I'm going to say a thumbnail focusing on a donkey's doodah will not be welcome... but I can't see there being any problem with a full-size shot of a donkey who just happens to have a penis.

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire