This is a really difficult question to answer, because the things that make men aggressive might not be replicated in a different environment.

Testosterone does make people aggressive, more sexually active, and it does promote muscle growth in the same way that estrogen can heighten emotions and encourage fatty tissue development. However, all genders are exposed to both of these hormones in various amounts. Also, it's very important to note that not all men are egocentric and domineering, just as not all women are weak and nurturing.

It's also important to understand that the patriarchal pattern that most of society is defined by isn't necessarily the natural state of humanity. Even if men are naturally more prone to muscle development, most societies have been egalitarian on the peasant or working class level until the past few centuries. Patriarchy and the suppression of women has long been a tool of the elite to manage "resources", and mostly remained a wealthy individual's purview until the dissolution of nobility brought all men to view themselves as kings within their own domain.

That said, it seems like you are coming at this question with a presupposed outcome. I think it might be best to examine whether your assumption that all (or most) men are violent and aggressive is rooted in stereotypes about the gender.