Sexual orientation (also often referred to as sexual preference) is simply described as what combination of gender and age range one finds sexually appealing or attractive in another person.
Pederasty - The original form of pederasty was a culturally sanctioned relationship in Ancient Greece in which a mentor and a pupil would be bonded into a relationship of mutual love in which the erotic attraction of the boy was an important factor.
Ephebophilia (also called hebephilia) is a sexual attraction to pubescent boys or adolescents. It is often used by boylovers wishing to distinguish an attraction to teenagers from an attraction to younger, pre-pubescent boys (described as pedophilia).