They never show anyone holding someones head up on the front page, although I can see where you are going with this. For me as well, I read this as a hobby while at work, the front page is not good for me either. While its hard to explain tortured bodies of whats happening in Mexico, it will be impossible to explain the nudity to my boss.
This is a pretty surreal request, there have been all kind of gruesome images on front page, if that´s not a problem at work I can´t understand how a pair of boobs would be a problem, it´s obviously not porn but also part of the same violence.
In any case, I´m against such censorship, against any censorship of news really, and also the whole "cover the boobs but keep the mutilated bodies coming" thing sounds beyond wrong.