Now you all know the REAL reason those women get the ultra-fancy multiple-setting shower heads. And it ain't for washing their hair.
Also... How the hell does Usa-chan, being as thirsty as she is, not know about slicking? Okay, maybe using a shower head never crossed her mind, but... she'd have to know. I mean, come on. That said, her family's water bill is probably going to go through the roof now. "Usa-chan, that's the 5th shower you've taken today."