I've read somewhere that humans are of the few (only?) mammals with permanant breasts. So that might suggest that breasts are something of a sex symbol and that

I've read somewhere that humans are of the few (only?) mammals with permanant breasts. So that might suggest that breasts are something of a sex symbol and that there is some precedent to having women cover up their breasts. At least it seems to make our cultural standard logicially consistent.