Maybe you should consider what else happens in hotel rooms. For example, did you know that many hotel/motel room bedspreads are NOT cleaned after each visitor? Oh, the sheets and pillowcases are changed, but often not the bedspreads.

Now, think about what goes on in a hotel room on top of a bedspread. The least of which is some disgusting human being sitting or laying butt naked on it. And it may just be the part that's up close to your face while you're sleeping.

Then of course, is the possibility that they were sexually active during their stay. I think you can now use your imagination to see what else may be happening on a bedspread which you assumed was clean.

And you're worried about a robe? Heh!