I think that it's only natural. I mean, it obviously depends, some people aren't built for monogamy and no amount of time is going to change that, but on the flip side...some people are built for it and no amount of time is going to change that. It's just a matter of making that connection with someone who is like-minded. For me, the novelty of casual sex has already kind of worn off. But that's just me. Some people might be more interested in it for longer because they felt sexually repressed back home or because they still haven't figured out their own sexuality. Or because they just want to get to know their bodies and their likes and dislikes and they don't necessarily want to feel obligated to the person who helps them explore that.
It's just not for me.
I wouldn't let yourself get discouraged. I heard people haven't even been here a whole month, even the first group that came in. It can take some people years to trust someone enough to feel inclined to commit themselves to that person.