A few days ago I had a conversation with a Japanese friend about the Japanese culture and the way Japanese have adapted the Western culture. She said something that was very odd to me: according to her there hasn't been any concept of "romantic love" in Japan before knowing the Western culture.
Wow! This means even a simple thing like romantic love -that we think is so embedded in our soul- is a behavior that we learn. It means there is nothing instinctive about it. We just make ourselves "to beleive" in that kind of love.