Really kind of hard to say. Usually one piece costumes like this have padded or lined crotches for sweat.
My guess is that it probably is more than just sweat. She kind of makes a point of displaying her dry ass, kind of suggesting that if she had wet her pants her butt would be wet. Seems dry though while her puss is quite wet.
The thing that makes it real sexy is that she doesn't seem too worried about her wet patch.
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