you canot be 100% certain the shower towels are actually washed, or just put into the drier.
i'd never sit down on anything in a shower room, as you do not know what the other driver "left behind"....crabs, gonorrhea, feces pieces, etc,etc.
i personally had witnessed a shower attendant at a southern trucks top wash the floors with blackend water, and then use that very same mop and water to wash out the shower stall....
you wanna chance the shower towels were really washed, and not just dried??
when you witness what i have over the years, you don;t take too many chances.