The official definition of queer is odd or weird, but in pop culture/society it has been transferred to reference gays/lesbians. After watching this movie I think that the "queer" aspect is minute compared to other themes that were more prominent; such as monster, reversal of roles, and male castration. Catherine's actions in this movie were excessive, manipulative and unpredictable. Catherine is the type of woman who does whatever she wants, and whoever she wants. I think the lesbian plot was purely to show more depth to Catherine's character, I don't think there was any intention of having the lesbian be a "monster", rather the tendencies of Catherine were there to show how evil she was. As the director put it "being gay is not an issue…There is a dark layer to the movie, and I always felt the movie was about evil, but I never linked that feeling of evil with preference of sexuality." I can understand why people were frustrated with the monster being lesbian, but honestly watching the movie now that gay/lesbians are more accepted I did not find that story line offensive.
I was personally disappointed with the movie ending as patriarchal. The roles were being reversed throughout the entire film, with female domination. Nick kept feeling emasculated by being turned down by Catherine and Roxy. So he met up with Beth and exerted his dominance over her by nearly raping her. Catherine and Roxy's relationship was male castration to Nick, it demonstrated that the men were not necessary to the women. Catherine's character was so wild and free I just never expected her to succumb to a man. So I consider the ending as Catherine tricking Nick and she actually still plans on killing him.