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The human-like species in these games can be broadly classified into three types (a, b, and c) based on the presence or absence of gender differentiation, the appearance of the characters, and whether they exist in vanilla games or not. More detailed classification such as b1 and b2 highly depends on Bethesda and Obsidian's game designs. This distinction can be attributed to the game design approaches of these developers, not relying on logical reasoning.


a) Gender-Neutral Humanoid Races - No female skin textures in vanilla games.

     a1. Super Mutants and Nightkins.
     a2. Feral Ghouls.
     a3. Aliens.
     a4. Trogs and Swampfolk. (Thanks for the info, MuteSignals. Will be added to the PDF tutorial)
     and etc.

b) Gendered Human & Humanoid Races - Non-nude female skin textures available in vanilla games.

     b1. Playable Vanilla Human Races
            - Caucasian, African American, Asian, and Hispanic. 
            - All females in this category share the same female body skin textures.
            - Therefore all modded body mod that includes their own nude body meshes require custom female nude skin textures. 

     b2. Non-Playable Vanilla Human Races, Part 1 (Excpet for Tribes)
            - Wasteland Raiders, Pitt Raiders, Powder Gangers, Vipers, Great Khans, and Fiends.
            - All females in this category share the same raider female skin textures except for Powder Gangers. No females in Powder Gangers. 
              cf) Not sure whether the Powder Ganers use the same raider male skin textures. Need to check.
            - Situation is the same. Requires the proper nude skin textures, the raider female nude skin textures. 

     b3. Non-playable Vanilla Half-Ghouls.
            - Requires proper nude skin textures for modded body meshes. 

     b4. Non-Playable Vanilla Human Races, Part 2 (Tribes only)
            - Tribes in Point Lookout DLC in FO3. Tribes in Honest Hearts DLC in FNV. 
            - Tribal females in Point Lookout DLC use "tribal female" nude textures. 
            - For the other tribal females in Honest Hearts, I'm not sure about this. I've always played NV as vanilla as possible. Need to check. 
            - According to AntonioBarbarian, the Honest Hearts tribal females and the Point Lookout tribal females don't share the same tribal female textures folder structure. 
            - He informed me that the Honest Hearts tribal females use their own caucasian female textures. 
            - The HH tribal females are certainly included in this classification, but they use their own mesh and their own textures and their own folder structure. A bit complicated case.
            - I will fix this mistake in the PDF tutorial that I'm currently making. No need to upload another new image here. 

c) Then there is a huge place for custom (female) Human & Humanoid races. Of course, custom body skin textures are needed for them.


* Image Credit: Fallout Wiki (combined several images)