Conservative MP Andrea Leadsom has warned that "inappropriate material" is being shown to children as young as five during some sex education lessons in primary schools.
Ms Leadsom voiced her concern during the debate on sex and relationship education in primary schools on 25 October 2011.
The South Northamptonshire MP also called for relationship advice to be taught side by side with the mechanics of sex so that children understand emotions such as "feeling used, dirty and awful about yourself".
Upper Bann MP David Simpson suggested bringing in external experts to schools who would be fully qualified and experienced enough to teach sexual education.
Liberal Democrat MP Annette Brooke argued that the starting point should be with training teachers so that they are properly equipped to deal with the subject.
Pamela Nash, Labour AM for Airdrie and Shotts, argued that sex education in primary and secondary schools would help to reduce the UK's teen pregnancy rate.
Schools Minister Nick Gibb made it clear that the government will not make sex and relationship education compulsory in primary schools and there will be no change to current sex education legislation.
According to Nick Gibb, "the current statutory arrangements strike the right balances".