Am a bit late coming to the debate, but OP YANBU.
I don't read the Sun and will never buy it, but it does affect me because it is always around, on the bus in cafes or whatever. And because it is a so-called 'newspaper' it influences others. As so many of the comments on this thread show, people obviously think that it's fine, normal and a valid career choice for young women to be portrayed as sexual objects and ogled by millions of men. It's part of the whole way that we view women as a society.
"During the early 19th century, it was also considered inappropriate for a woman to publicly display her ankles....history and societal perceptions evolve. Centuries from now, I wonder whether the naked female breast will still be considered a prosecutable offense or a societal taboo?"
In response to theshriekingharpy - it's not the naked female breast I object to, it's the fact that they are portrayed as purely sexual. If a national newspaper wanted to publish a whole range of pictures of women and men going about their usual business in the nude, I would consider it quite bizarre but I wouldn't object. I quite like the art that you occasionally see where the artist gets loads of people to get naked somewhere and takes a photo- normal people, no distinction made between male and female, and not held up as an example of how women should look.