Why do (most) asian men have less testosterone?

Ok i don't know if this is actually true but one reason may be linked to evolution. Think about it, in Africa there are large animals like lions, elephants, etc. Back in the day, black people would have had to defend themselves against animals like that. So they become larger or as you would put it, have more testosterone. In Asia however there aren't nearly as many threats. Sure there are tigers and stuff however their body would be beneficial in the area they live in. This also explains why people who live on islands are smaller. There are less things to defend themselves against. And no you are not racist. Sure your question is generalizing a bit but honestly everyone has a bit of racism in them and you can't ingore that people of different ethnicities look different.