I don't think it is. My only problem with Shirow Masamune's work is that his style differs a lot in the same picture for the same subject. Not to sound insulting, because he is very talented, but his work sometimes looks like someone too a Boris Vallejo painting an stuck a face from Ranma 1/2 then matched the colors. Just look at all the different characters in this one. The Audience doesn't match the girls or the "Captors" and they most certainly doesn't match the girls themselves. Really only the eyes seem to match with styles.
The vag is more than likely a shop, every other image of Shirow's I've seen it's either smoothed over or conveniently censored. Japanese law and all that jazz.