I think they mean those pics of woman from behind who are out ojn a random day of shoping or something, not people in parades Believe me, parade people are camera horny as HELL...
(I love photography and spend a lot of time doing it, and thus i know the effect of a nice dSLR and big lens on women in parade's first hand, it's rather amusing :P)
As for the question, streetshots good or bad, mixed feelings over here. But i don't see it as all that bad.
But well, i'm a wierdo over here probaby, i just love to see a womans face as well, just the hair alone (a backside sneak shot) just doesnt do it for me, so i hardly ever have those, and face shots hardly ever go unnoticed so i don't have the issue there