Why do I have two kinds of pubic hair?
Relatively interesting evolution question --- hypothesis regarding reasons for certain evolutionary traits can be debated (this particular question, scientists seem to have many theories). However, here is one possible explanation: 


Pubic hair near the sexual organs is likely for hygiene function; especially for women infections from parasites were common in those areas. The hair would act as a protection barrier, and hence the different texture of that hair being a little thicker.  
Pubic hair in arm pit regions may keep pheromones, or chemicals your body produces that send subconscious messages to other humans. Often, these chemicals are released from sweat, and hence it would make sense to have hair in those regions to trap them there. The texture of the hair in those regions probably evolved to be more effective in keeping oder. 


https://www.self.com/story/why-you-have-pubic-hair
https://blogs.scientificamerican.com/bering-in-mind/a-bushel-of-facts-about-the-uniqueness-of-human-pubic-hair/