Too true, alas
Look at muscled characters: titania, Stunner, Punchout... all villainesses. 
Except maybe "Rigger" Ruiz of Code: Blue 

That doesn't explain why male character without superstrength (Ex: Cyclops, Bishop), have more muscle mass than female character that do have superstrength (Rogue, Mary Marvel)

I think it all comes down to the false assumption that muscle and strength are specifically male traits.

But like I've said elsewhere, no point acting like things aren't better than they've ever been. I mean, I was reading She-Hulk #38 the other day and even if she isn't quite as buff as she is on the cover, she's pretty damn buff - dare I say, hulking. Not only that, Jazinda is half-naked and that girl had abs of steel and to stick with the green girls... Lyra was certainly depicted as well built (and her aunt too).

So, I feel that... we've never had it so good and that anyone bemoaning the state of affairs should have a bit of perspective. Yes, things can always get better but while we may have to endure Whedon Waif Syndrome... there's plenty of good stuff out there. They aren't pulling any punches with Powergirl these days. Which makes her secret identity HILARIOUS, as Lingster points out.

As a picture is a thousand words...

This will be in the interest of brevity.

Which was pretty much what I was thinking through the whole first issues of Powergirl - at least Superman has glasses. Powergirl... she doesn't even really change her hair or dress down. I swear, someone must have just made people in the DCU miss the bleedin' obvious at the genetic level.