Lisbeth has two sets of brushes here which you can use to add pubes to an existing texture map, or place directly on your render (depending on pose, camera angle, etc)
72 Brushes for Photoshop ~ Eyebrows, eyelashes and pubic hair
96 More Brushes for Photoshop ~ eyebrows, eyelashes and pubic hair

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire