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Ephebophilia also known as hebephilia is the sexual attraction of an adult to adolescents.

Ephebophilia is not considered a disorder or perversion. It is natural for adult men to have a sexual attraction to especially young girls. However, the people attracted to may be below the age of consent, also depending on the jurisdiction.

Often paedophilia and ephebophilia are confused. The reason for this is that definitions of the legal age and the biological age of a child conflict. According to some catholics, the child abuse cases in the American church often have nothing to do with paedophilia, but instead are instances of ephebophilia.

http://en.wikipedia.org/wiki/Ephebophilia

Algolagnia
n. taking sexual pleasure in inflicting or enduring pain.
algolagnic, a. algolagnist, n.
Tiscali reference