It’s called Paedomorphic Evolution: Genetic Pacification selecting for lower maturity – the “juvenile”. One of which is Gracilization: loss of bone mass. The ‘strange’ sexual interests of the Japanese (and the asians) and our men’s attraction to Asian women, is very likely due to the greater paedomorphism of the asians and the lower levels of testosterone. The east and the west have been engaging in genetic pacification over a long long time. The rest of the world has not. Because they were unable to reduce the bottom population.