A bit of lore about the folks from where Octavia comes from.
A couple of seafolk (for lack of a better name) having a conversation.
Seafolk are born with both sets of genitals. They are not assigned a gender at birth, but rather choose their own once they have come of age. (Some decide not to pick one, that is normal.)
So yeah, that guy there has a vagina.
Also - they don't normally wear clothes. Jewelry is common, but their bodies are able to handle the temperatures of the water with no issue.
They also are born with a second pair of eyes higher on their heads that aid in their seeing while swimming around. This gives them an increased field of vision and spacial awareness.
You'll also notice that most of them have some sort of patterning on their bodies. This is not an absolute, as many do not have these spots/stripes - but it is fairly common.