Sweetie that’s left over enema water with some ass mucus in the mix. Unless you the type of bottom to add lube in there so you could claim “oh daddy, you got me creaming on that dick!”
Seriously, the ass isn’t a vagina and doesn’t just ‘get wet’ when you’re horny. It may produce more mucus when you’re constipated or have an urge to use the toilet.
Unless you aren’t a human, then yes, your anus may get wet like a vagina when you’re horny! In that case, you’ll need to phone home and consult with a galatic alien doctor because we humans don’t understand your biology and alien bodily functions. Unless you want to offer your anus up for scientific study and research.
I have people telling me they’re special because their lips change colours depending on their moods, their lips can turn purple or blue when they’re depressed or pink when they’re happy. No bitch! Your lips lack oxygen that’s why they’e changing colours and you need to see a doctor stat!
TLDR: I’m not sure if OP was exaggerating the wetness of his anus when or really thinks he has a special anus that behaves like a vagina + can ovulate.