About 1% of the male population has a sexual interest in children. Most of these people will never act on that interest, but some of them do go on to commit offences.

There is a range of jargon, and that makes searching for information a bit trickier.

OCSE = online child sexual exploitation. CSEA = Child sexual exploitation and abuse. CSAM = child sexual abuse material.

Here are some UK stats:

> Law enforcement agencies in the UK are currently arresting around 450 individuals and safeguarding over 600 children each month through their efforts to combat online CSE.

> In the UK alone, it is estimated there are 80,000 people who present a sexual threat to children online.

> Statistics from the National Crime Agency (NCA) show that last year 2.88 million accounts were registered globally across the most harmful child sexual abuse dark web sites, with at least 5% believed to be registered in the UK.

These are good reports, although they're obviously written from a child protection viewpoint.

http://www2.paconsulting.com/rs/526-HZE-833/images/WePROTECT...

https://homeofficemedia.blog.gov.uk/2019/06/25/fact-sheet-on...

https://www.iwf.org.uk/report/iwf-2019-annual-report-zero-to...

>> Nevertheless, if it is true that 95% of perpetrators are well known to the victim, that doesn't sound like this abuse is happening online

But that abuse often gets put online, or is traded to access other images.