Actually its not just a perception its a theory that has been proven to some extent and needs more research done on it. The experienced users dont just make things up in here nor does Androtics.
It is a fact that different ethnic groups produce higher and lower amounts of Hormones. Pheromones are hormones that work outside the body.
A high percentage of Asian men produce low testosterone. This is fact. So they produce less of the heavy aggressive pheromones that are derived from testosterone. Now lets move onto culture. There are studies in the abstract section that indicate that females attract to men with similar pheromone signatures as there male role models growing up. If they have grown up in a Asian country with little exposure to other ethnic groups Asian women are generally turned off by high anone signatures. Its to aggressive and distasteful to them.
In the USA we have a melting pot of ethnicities and cultures. In most instances we are exposed to other groups but we still tend to gravitate toward whats familiar to us from our male role modals.