Water will flow more easily through a wide pipe and electrical current will flow more easiy through a thick wire. Electrical resistance is greater in a wire that is hot. Remember the hotter wire has faster moving electrons and more collisions. Collisions in electrical flow slow down the progress of moving electrons and the fields surrounding them. Water on your skin creates a better conductor, thus lowering the resistance of your body.
Perspiration is salt water which is a very good conductor of electricity.
Therefore, the resistance decreases. Wet surfaces provide a path for electric current to follow decreasing resistance. Therefore, more current will flow. High voltage by itself does not produce electric shock. Distinguish between dc and ac.