Looking for a book series called which is about fairies and such has an adult nature. The author also wrote vamipires. What the name of this series?

You're likely thinking of the "Fever" series by Karen Marie Moning. This series features a strong heroine, MacKayla Lane, who gets entangled in the world of fae after a near-death experience.

Here's why it fits your description:

* Fairies and Fae: The series is heavily focused on the world of fae, including a wide variety of creatures, magic, and societal structures.

* Adult Nature: It explores mature themes like sexuality, violence, and complex relationships, with a dark and gritty atmosphere.

* Vampire Author: Karen Marie Moning is also known for her "Black Dagger Brotherhood" series, a popular vampire romance series.

The "Fever" series consists of nine books:

* Fever

* A Darkness at the Edge of Dawn

* A Whisper of the Wicked

* A Hunger Like No Other

* A Shadow of the Sun

* A Dream of a Thousand Stars

* A Memory of Shadows

* A Kiss of Midnight

* A Touch of Frost

Let me know if this is the series you were looking for!