Jake Paul says his fight with Tommy Fury was soiled from the start -- the Problem Child just revealed he had a wet dream before his loss to TNT ... which wasted all the testosterone he was building up for weeks.
Jake went into perhaps too much detail on his brother Logan's "Impaulsive" podcast this week ... when he admitted his, umm, "release" pissed him off to the point where it may have factored into how he performed in the ring.
Logan -- who says he experienced the same problem prior to his fight against KSI -- explained the reasoning behind the practice .