The defendants, identified as Sean O and Marco K, contacted their victims on social media network sites and pretending to be teenage boys of the same age, DutchNews.nl said.
They then encouraged the girls, whose ages ranged from 10 to 15, to carry out sex acts on web cams.
If the girls refused to continue, the men threatened to rape them or publish the photographs, authorities said.
Police said they found 86 pornographic images of children, 370 films and 6,000 pornographic conversations on Sean O's computer.
Marco K, who was a volleyball coach, had 160 pornographic pictures on his computer.
Sean O been sentenced to four years in jail, DutchNews.nl reported Monday.
The court found that Marco K was suffering from a sexual psychiatric condition and not fully responsible for his actions.
He was sentenced to two years in jail and has been barred from working with children.
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