The rules of Meat Space are intentionally kept as detached from physical appearance as possible. Players should feel empowered to create and represent their Characters however they wish. What your Character wears, looks like, carries or how they present themselves is ultimately a matter of personal taste, and your aesthetic preferences should take priority.
This extends to gender expression and identity. While some Races may exhibit sexual dimorphism, it is up to each Player to decide how their Character looks, presents themselves and expresses who they are. These choices belong to the Player and should not be dictated by others at the table. The 'sapes of the Federation don't give a fuck, so neither should you.