The is made up of all of the nerves that connect the central nervous system to the rest of the body.

answer:

well the blood rushes to the vessles in your pp (lol) it also happen because u see somthin erotic or pleasing somtimes it happenes by accdent or by purberty or an dream (know an an wet dream)

explanation:

...~ Activity theory predicts that older people will do different activities than younger people, with more time budgeted for leisure. The relationship between age and time spent doing these leisure activities with others, under activity theory, is hypothesized to be positive. ~...

I hope I helped!~

-Koko uwu

In my opinion I think viruses can be cured. Due to the fact people found cures to them so I think they can cure viruses.