Hey Sandy, I did wonder if I was missing your point, and (duh) perhaps I still am. I'm having a dense-headed day, it seems. I guess I figure that, if one is to understand how this particular image may offend some people--Christians in particular--one does need to take as given the same things they do: That Mary was indeed a Virgin, and that the billboard image represents her.

For me to understand another's viewpoint I need to step out of my own view, which is that either virgin birth is either totally impossible or the extremely rare parthenogenesis, in either case not a godly insertion or blessing or insemination or what-have-you. I need to shed that view for long enough to step wholeheartedly into the other POV. A kind of walking a mile in their shoes. Which is why I didn't follow where you're going with idea that it's merely the eye of the beholder. It is ENTIRELY the eye of the beholder, and there are very specific beholders who I'm trying to understand more about.   

Yes those who are offended by the billboard can avert their eyes and not continue to look at it (a bit more practical than literally plucking out one's own eye). But they will still have seen it, still perhaps have felt offense, and if they did, I still want to know exactly how the image conflicts with their views and caused them to feel offended.