The BBC said it regretted featuring convicted sex offender Jonathan King as a guest on a Radio Five Live's morning show after a string of complaints.
Disgraced pop mogul King was jailed in 2001
King was released on parole in April after serving half of a seven-year jail term for sexually abusing young boys.
The BBC said the interview with King was intended to examine the possibility that his "state of mind was typical of perpetrators of paedophile crimes".
But it admitted it had "failed to shed much light on the wider topic".
Twenty five complaints were lodged on the corporation's complaints website, following the interview with the 60-year-old pop mogul on Victoria Derbyshire's morning show on 26 July.
"Jonathan King's case prompted much interest, because of his own high profile and the nature of his offences," said a statement on the BBC Complaints website.
"It was not our intention to give him a platform to assert his innocence, but to challenge that assertion rigorously and to examine the possibility that his state of mind is typical of perpetrators of paedophile crimes."
"We were robust in challenging his protestations of innocence but - on balance - we probably failed to shed much light on the wider topic."
"We regret this. We also regret the offence caused to some of our listeners by our attempt to use a high-profile case to tackle a very difficult topic."