I used to think that scabies don't affect humans, only animals. But that's not the case at all. It's even possible to get scabies on the genital area from hotel sheets. This is why I always ask for fresh sheets and change them myself when I'm staying at a hotel.
The crazy part is that it can take weeks or even a month for symptoms of genital scabies to show up. So you might not even remember how you got infected with it by the time the symptoms become apparent.