SPECIALIST teachers should be drafted in to teach school classes on sex and relationships, MPs say.
The call came from the Commons Health Select Committee, led by Wakefield Labour MP David Hinchliffe.
His committee said it was "deeply concerned" that most of the classes were taken by form tutors, rather than specialist teachers.
MPs recommended that by 2007 all such education should be taught by a specialist teacher.
Mr Hinchliffe, whose constituency includes Kirkburton and Denby Dale, said: "Educating young people about relationships and sexual health is one of the most powerful tools we have to promote better sexual health.
"However, young people are still being taught about sex and relationships by teachers who lack both the competence and confidence in this area."
He spoke as his committee issued a report saying sexual health services in the NHS are more overstretched than ever.
Long waits face patients seeking treatment.
A total of £130m in extra funding is promised by the Government over three years to help combat soaring rates of sexually transmitted infections (STIs).
But MPs said there was a continuing sexual health crisis in the UK which needed to be urgently addressed.
Mr Hinchliffe said: "They need to monitor the situation closely over the coming years to ensure the extra investment actually reaches clinics to enable them to deliver better services."
Figures from his committee's report showed that in 2003 there were more than 670,000 STI diagnoses in England alone - up 57% since 1995.
Last year there were 89,431 new diagnoses of chlamydia - the most common STI - in the UK, with 68% in people under 25.
But despite the growing crisis, the report revealed there were still long waits at genito-urinary medicine clinics.
The Government wants all patients to be seen within 48 hours of requesting an appointment.
But the report said that the latest figures showed only 38% of people got an appointment within 48 hours, and 26% waited more than two weeks.
Public Health Minister Melanie Johnson said: "Tackling the rise in sexually transmitted infections is a Government priority."