Its like a predator-prey
Okay, what i don't get until now, in my 22 years of existence is why the hell adults would want to insert their penises on a young woman? Or why a woman (yes, there's circumstances where woman is the predator) would want to chase a young boy?
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Lust for power. Apparently, due to analyzes about child porn distributors(and producers) I've recently read, most of the perpetrators weren't actual pedophiles.
Most of their crimes and actions could be traced back to character traits like a strong need to feel powerful. To rule, to inflict pain, to feel empowered by using and misusing somebody. And the most convenient targets to such desires happen to be younger people aka children. It's just so easy to scare and intimidate young people with sexual abuse. So it isn't the sexual desire but the need to dominate others you have to keep in check.
This doesn't explain every single case of course.