Cat 1) Wet Sensation
Cat 2) Wet Underwear
Cat 3) Soak thru to inside of pants
Cat 4) Soak thru pants (Visible to general public)
Cat 5) Runs down to socks. (Oh my god, run for your life)
Anything of Category 4 or higher require showers. The lesser categories can be dealt with using alternative cleansing methods.