Yea we are on the same boat. It does a bit confusing to me as well. As supremekai here clarified that if the prostate is stimulated enough or if you're ho*** enough then seminal fluid (which is clear and slippery in nature which acts as a natural lubricant) will leak out from the pe***.
But I believe it wasn't our fault to misunderstood that since it usually implied that the butt**** was wet in the heat of passion in bed. When in reality the pe*** was wet. Since seminal fluid leaked out of pe***.
Celest