Yeah, if its OK to discriminate on the basis of the immutable characteristics of the Gender class, it should be OK to discriminate based on other characteristics as well.
Its very bigoted and regressive that you can be charged a 'cover' just because you have the wrong genitalia and belong to the wrong gender. I don't see how that's any better then charging a cover because someone has the 'wrong' skin color.
Of course, we have very bigoted courts here in the US that consistently rule to discriminate against men. I promise you if people respond to this comment it will be to argue how discrimination against men is justified and should continue.