According to my copy of The Concise Mythological Dictionary by Peerage Books, Selene is the Greek goddess of the moon, the daughter of the Titan Hyperion and the sister of Helios (the Sun) and Eos (the Dawn). The book says: "She fell in love with the beautiful shepherd Endymion and caused him to sleep so that she might caress him undisturbed."
The description of Selene on http://www.godchecker.com/states:
"SELENE: Silvery Goddess of the Moon. She is pale, beautiful and indefinably alluring... Selene also enjoys romance, and has shared kisses with more people than you could count on a long winter's night."
Selene is often depicted wearing a crescent moon on her head, which represents the new or young moon.
The Concise Mythological Dictionary