I think I've figured out what would have to be changed. In the misc_tables.vpp_pc file, there's a xtbl file named "customization_default_items". And in it, it says as follows.
<Default>
<Item>male_body</Item>
<Wear_Option>cm_body.cmeshx</Wear_Option>
<Variant>01 - Default</Variant>
<Gender>male</Gender>
<Race>white</Race>
</Default>
<Default>
<Item>female_body</Item>
<Wear_Option>cf_body.cmeshx</Wear_Option>
<Variant>01 - Default</Variant>
<Gender>female</Gender>
<Race>white</Race>
</Default>
And I've found out "cf_body.rig_pc" and "cm_body.rig_pc" in the "preload_rigs.vpp_pc". So I'm guessing that "cm_body.cmeshx" and "cf_body.cmeshx" should be in those "cf_body.rig_pc" and "cm_body.rig_pc" files, and if you can extract them and copy and paste those breasts and penis respectively for each other, you can create hermaphroditos body meshes. But I'm stuck here. I looked up and searched it, but it seems there's no way to unpack rig_pc files. And even if there is, I'm not able to fix them myself. I have zero experience with 3D tool, much less, I don't have any disc space to install tools right now.