I like this one. I'm not certain why people keep mentioning weapon use, its human shaped so it can uses a weapon its default weapon is no better then claws so it doesn't increase the monsters threat. But it makes sense to have the dagger if it wants to defend itself and still maintain its illusion of humanity.
As far as I can see it never specifies that all members are female so I would not assume that is the case. A man can seduce people to.