why IS it such a big deal to bare your breasteseseseesess?

i have wondered that from time to time. why do men go absolutely MENTAL when they see a bare breast? what the hell is the big deal?

Sacramento -- A federal judge denied on Friday a request from a group of Mendocino women who wanted to protest topless on the grounds of the state Capitol.
U.S. District Judge Garland Burrell said the group made no compelling argument that showing their breasts constitutes free speech.
"Being topless is not inherently expressive" speech, Burrell said. The group, Breasts Not Bombs, had scheduled a protest for noon Monday. The California Highway Patrol threatened to arrest anyone who went topless.
Sherry Glaser, a leader of the group, said the protest may take place without bare breasts.
"All we really have is the power of ourselves," she said. "Our bodies bring attention."
Group members, whose protest on the west steps of the Capitol is intended to contrast the "indecent" initiatives backed by Gov. Arnold Schwarzenegger on the November ballot with their "natural and decent" breasts, sought a temporary restraining order prohibiting CHP officers from arresting women who protest topless.
The First Amendment protects their right to protest bare breasted, the group argued. "The very act is a dynamic and fully expressive statement worthy of constitutional protection," their brief asserts.
But Burrell didn't buy that argument.
"Do you think the founding fathers had this in mind when they drafted the First Amendment?" he asked Matthew Kumin, the lawyer representing Breasts Not Bombs.