Another factor that might able to contribute to gray pubic hair is buildup of hydrogen peroxide that is in the hair.
Regardless, you can dye your pubic hair using regular hair dye, as long as you protect your skin and choose one without harsh chemicals.
In addition, if red hair is so rare, imagine how rare red pubic hair is.
For example, the myth of redheads bruising easier could be for their fair skin tone, making dark spots more noticeable.
One of the hypothesis as for why the hair goes gray indicates that aging slows or even stops hair from accessing melanin, so it comes out to be gray, silver, or even white instead.
How do guys dye their pubic hair? But the fact that there are multiple people.