Fornication fills the nadis with psychological filth and astral parasites.
Walking in cold air and by the sea (inhaling and exhaling through the nostrils) can help purify these channels. However, scientific chastity and sexual magic will regenerate these nadis fully.
For thirty years I sought God. But when I looked carefully I found that in reality God was the seeker and I the sought. -Bayazid al-Bastami