Talk:Incubus/@comment-29602226-20170326071950/@comment-10429980-20170327043730

+Galeah To answer your question, monster mana does get absorbed into a male's body, it just doesn't take it over like it does a woman's body (in which her weak ability to produce human mana is destroyed). Instead in a man a kind of balance is reached where the monster mana that has been incorporated instead enhances his ability to produce human mana, turning him into an incubus over time.

Most monster mana types have a low retention rate in men, which is why it can take a fair number of years before one becomes an incubus via sex with them. Succubus mana however has a stronger retention rate (to the extent that its possible to become an incubus after having sex just once with a succubus), and it is that type of mana that dominates the air of most mamono realms, probably making it easier to turn men through regular absorption.