Sue Berelowitz, the deputy Children's Commissioner, said that Britain needed to "get to the bottom" of child abuse as the commission embarks on the new inquiry.
"We need to stop the abuse and work very hard to do that, so for all kinds of reasons we have got to get to the bottom of what's going on," she told Good Morning Britain.
The Children's Commissioner has said the public will be shocked at both the scale of family child sex abuse and the way in which victims are treated.
Dame Maggie Atkinson has ordered a two-year national review of chid sex abuse within family environments, including arising from forced marriages.
"Society is rightly horrified by child sexual abuse," Dame Maggie said.
"Most of our children are raised in secure, loving homes but I am sure very many of us will be disturbed by how much abuse within the family environment goes unreported and how little is done to support the children who suffer," she added.
The Children's Commissioner is launching a new two-year nationwide inquiry into child sex abuse in families.
The inquiry will particularly look at the issue of forced marriage, since this is thought to often lead to abuse.
Among the questions examined will be how widespread the problem is, how to support victims and how to prevent abuse.
The senior foreign minister Baroness Warsi has said she is concerned that political correctness could lead to statistics on the sexual abuse of children being distorted.
She said: "If the victim takes us to a perpetrator who is white, black, brown, of whatever religion background, then we must investigate that fully".
It even describes a catalogue featuring photographs and the ages of children for abusers to choose their victims. Here are some of the details from 12-year-old Teegan's case:
- She was taken by a man to a series of "mansions" where she was raped by multiple men
- The men paid up to £500 for an hour with her
- Groomers would form 'relationships with vulnerable children on the street before passing them on to the men who ran the business
A report on sexual exploitation of children by gangs and groups has been criticised for failing to highlight the number of perpetrators identified as 'Asian'.
It also quotes a former Labour MP as saying it is wrong to ignore a statistic that is “staring us in the face”.
The Deputy Children's Commissioner Sue Berelowitz has countered criticism of her report on child sexual exploitation describing it as "calm" and "measured".
She also said there was a risk of too much attention being given to high-profile cases involving Pakistani men.
She said this was just one of many models of exploitation and that data on the ethnicity of perpetrators only exists in six out of 10 cases.
- Marina was regularly sexually exploited by local white shop owners in exchange for alcohol and cigarettes
- Her 14-year-old sister was also frequently abused
- She was driven to parties where she would be raped by multiple party-goers
- She also reported going to parties at her older "boyfriend's" house where she was passed around his friends