As someone who has spent way too much time on the road and living out of hotel rooms, I have a little prevention suggestion...
When you check in to a hotel room, you usually have no idea who was in the room before you, or how well the maid cleaned or disinfected the tub or bathroom floors. Think "paranoid", and assume they're contaminated.
To help avoid the possibility of spreading something to more sensitive areas, be it athlete's foot, jock itch, or whatever, it's a good idea to put your socks on first, before pulling on your underwear. That way, even if you've already managed to 'put your foot in it', you won't be dragging the stuff up to your crotch.
I don't remember where I first heard this suggestion, but it makes a lot of sense to me.
The other thing that goes along with this is when showering, start at the top and work your way down. The same goes for toweling off, again, starting at the top and finishing with the feet.
These same suggestions apply as well to using the locker room and showers at the gym, only I also strongly advise using plastic shower/beach sandals as well when walking around. There is just too great a chance of picking something up from the locker room floors otherwise, even in the cleanest facility.
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