"Responsible adults should not put graphic details of teenagers having sex on the web," she said.

'Ill-advised'

Townshend's message on his website also apologised to "those of you who were beginning to enjoy it".

"I have to accept that even if I write fiction I do so as someone who is well known and carry my past and controversy with me," he added in his blog.

The story was entitled The Comedian.

A spokesman for Townshend said there would be no other comment from the guitarist other than the post on his website.

Tink Palmer, of children's charity Stop It Now! said: "Bearing in mind that he is on the sex offender's register and received a caution, it is most ill-advised, especially considering the popularity of his music and the fact lots of people look up to him."

Townshend was arrested in 2003 as part of Operation Ore, which investigated child pornography websites.

He denied being a paedophile and said he visited a site to research his autobiography.