The definition of pedophilia is actually quite clear see for example the Encyclopaedia Britannica:
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| pedophilia, also spelled paedophilia , psychosexual disorder in which an adult has sexual fantasies about or engages in sexual acts with a prepubescent child of the same or the opposite sex. | |
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http://www.britannica.com/EBchecked/...575/pedophilia
The fact that the yellow press is using the term pedophilia differently does not change it's definition. But it is a fact that "Roman Polanski accused of pedophilia" makes a catchier headline as "Roman Polanski accused of having sex with an underage girl"