User blog comment:Shutupmerlin8/I just noticed.../@comment-5995315-20130201164524

Merlin's only girlfriend was Freya.

Because the show touches so much on male bonding, the characterizations of the females as antagonists or evil gives the appearance of sexism.

That's particularly true of the Evil!Gwen arc in season five, which set the girls up against the boys. Now that's not fair. Everyone knows that when women join forces, they always outwit the men!

Anyway, I've noticed that, too. The only idea I have right now is that viewers are fascinated when females go evil, but if a male turns wicked  it's not as interesting.