THE head teacher of a primary school where children were encouraged to

discuss sexual acts of unusual sophistication during a sex education

lesson admitted yesterday there had been ''an error of judgment''.

Parents complained after the 10 and 11-year-old boys and girls told

them how they had discussed oral sex and acted out the roles of people

involved in an extra-marital love triangle during an explicit

role-playing session.

Mrs Sylvia Snowdon, head of Highfield Primary School, in Shadwell,

near Leeds, West Yorkshire, conceded yesterday: ''In hindsight, I feel

that some inappropriate topics were covered and in this context an error

of judgment has been made.''

The lesson at the school, when the children discussed the use of Mars

bars in oral sex with a nurse who tours schools talking about sex and

hygiene, was condemned by the education authority.

Deputy chairman of education Tom Murray said after a meeting with

councillors and officials yesterday that the school's governors were

being asked to review the methods used in sex education.

Every school in the city is also to be contacted to be made aware of

sex education guidelines for young children.

''If true, then I condemn this wholeheartedly,'' he said. ''It is not

appropriate for 10 and 11-year-olds to discuss oral sex in a classroom

situation.''

The children were said to have acted out of the roles of ''Mummy'',

''Daddy'' and ''Mummy's lover'' during the lesson last week with nurse

Sue Brady, employed by the health authority.

They were told they could use whatever language they liked. The child

playing ''daddy'' had shouted: ''You've been shagging my wife,''

according to a parent.

One parent said: ''We are not prudes. My son knows how babies are made

and where they come from. But he doesn't need to know about perverted

sex acts. The children's minds are being abused.''

Mrs Snowdon said in a statement yesterday that parents had been

invited to a consultation evening to explain the content of her

workshops.

''At the time, Mrs Brady said she would answer children's questions as

honestly as she could. Parents were given the opportunity to withdraw

their children from the workshops if they so wished,'' she said.