Lostprophets frontman Ian Watkins has also been charged with the possession and or distribution of indecent images of children.
Detective Inspector Peter Doyle, of South Wales Police, has urged "anyone who has any concerns or information which they think may be relevant to contact us."
He added: "Safeguarding children involved in such cases is always a high priority and as such measures have already been taken."
More top news
Local authorities outside London want the power to fine vehicle owners if someone drops litter from their car.
A British family believed to have fled to Syria have joined Islamic State, according to a statement said to be released on their behalf.
After the heatwave come the storms, with lightning flashes illuminating the night sky across much of the country last night.