Sex and slutting are different things.
That makes no sense.
First off, we are talking about whole species here, not just any individual, so it is in our nature as creatures to seek pleasure, find love, and reproduce. And we don't always stick with the first person we meet, we usually end up having sex with lots of people instead of just one.
Technically though, the actual definition of "slut" is, 1. an immoral or dissolute woman. Or, 2. a dirty, slovenly woman. But over time, society sort of transformed the word "slut" to mean someone who has sex with many people, kind of like how the word "gay" used to mean happy, and now it means homosexual. So in this case, (where we aren't only talking about females, or just 1 individual, but 2 whole species) every species are sluts, because every species has individuals who have sex with many other creatures. So like I said before, which was a metaphor, saying foxes (or otters) are sluts is like saying blue is a color.
Well, doc, I-
AHHH! A FOX!
*climbs up onto nearest light fixture*
Now, I don't want any trouble. My asshole hurts enough.
What are you going to do to me, Fuzz?