maybe because women in those countries dont' try to have it both ways? women in this country wear pushup bras and low cut tops to attract attention sexually, then get flabbergasted that men start thinking breasts are sex objects.
It's kinda the other way around, isn't it? Why do women with push-up bras and low cut tops
get attention? I think it's because it's not a very common sight - breasts are usually covered up most of the time. And so when they finally get unveiled, straight men go gaga.
Like way back in the day, when women wore dresses down to the ground - all the time. The sight of a woman's ankle was enough to bring down entire civilizations due to the sexual licentiousness of it all.
Majority of the sexiness comes from the forbidden fruit thing. The less one has/sees of something, the more it is desired.