I'm wary of making assumptions about "natural" differences between males and females, since it's easy to confuse them with cultural stereotypes, ie. what you've

I'm wary of making assumptions about "natural" differences between males and females, since it's easy to confuse them with cultural stereotypes, ie. what you've learned to think of as "normal" vs. what actually is "normal". It may well be be that some component that's typically more prevalent in females plays a key role in the development of prosocial tendencies. If such a component were identified, it would be interesting to study its involvement in the development of both males and females.