Carefull though, that stuff bur s if it runs down your hand and into your richard, im prolly steril now.
Alright. I'm no physicist, but that statement seems off to me. Assuming your shower is on a relatively flat surface, gravity should cause the liquid to roll down your body towards the floor. A flaccid snake is also pulled towards the floor, so upon reaching the relative apex of your richardhead, the liquid would fall to the ground. Your richardhole would be entirely untouched by glow juice because the water would not roll down your richard then randomly make a U turn and go up your richardhole.
Since this isn't what you described, I'm forced to consider a second scenario: one where your richard was erect, causing it to point in a direction that gravity could actually cause water to travel into your richardhole. This normally would be fine, but I'm forced to consider that it may have been the excitement you've been raving about by means of the glow juice that caused you to become erect.
TL;DR: I'm pretty sure OP got a hard on from his own glowing body.