Nearly a quarter of parents are happy for their children to be taught about kinky sex in class, a survey has revealed.
Bondage and dogging are among the subjects they approved for discussion in secondary schools.
However, 27% of parents do not want homosexuality to be mentioned.
The survey of 800 parents, commissioned by Teachers TV, found that 74% of parents did not know whether their child was sexually active.
On top of that, 44% say they have never had an in-depth discussion about sex with their offspring.
It added that many teachers feel parents are shirking their responsibility to teach their children the facts of life.
Teachers TV spokesman Andrew Bethell said: "Parents have their heads in the sand when it comes to their child's sex education.
"They need to wake up to increasing teen pregnancies and recognise sex education is a joint responsibility."
