And if they can't get sex, the NHS pamphlet helpfully suggests, well, they could settle for masturbation..
The new leaflet, entitled Pleasure, has been drawn up by Sheffield primary care trust.
Under the heading 'an orgasm a day keeps the doctor away,' it says: 'Health promotion experts advocate five portions of fruit and veg a day and 30 minutes physical activity three times a week.
'What about sex or masturbation twice a week?'
Author Steve Slack, director of the Centre for HIV and Sexual Health and NHS Sheffield, denied the document promoted underage sex.
He said it could encourage young people to delay losing their virginity until they are sure they will enjoy the experience.
Mr Slack added that as long as teenagers are fully informed about sex and are making decisions free of peer pressure and as part of a caring relationship, they have as much right as an adult to a good sex life, Daily Mail reported.
But Dr Trevor Stammers of the pressure group Family and Youth Concern said the leaflet would encourage children into risky behaviour, which could result in them catching sexually transmitted diseases.
'If you look at the people who come into my surgery, it's the orgasm that got them there - not kept them away,' he said. 'It is unbelievable that this is being sent to schools.
'I'd like to know what scientific evidence there is to back this up. There are an awful lot of overpaid and under-occupied health promotion officers around who are obsessed with sex.
'This leaflet encourages the idea that there is nothing more to sex than pleasure, and inciting underage sex is doing nothing less than encouraging child abuse.
'If the NHS wants to promote a healthy heart, as it says it does in this leaflet, it should put the money into reducing smoking and alcohol - which cause far more cardiac damage than encouraging people to have sex.
'The strapline I'd have is - sex is an adult activity. Underage sex is as dangerous as underage drink and usually leads to sexual ill-health.'
Around 40,000 teenage girls fall pregnant every year in the UK - the highest level in western Europe. More than half end up in abortion.
Only last week it was revealed that a £6million initiative to reduce teenage pregnancies boomeranged - the number of girls conceiving doubled.
The Government-backed scheme tried to persuade teenage girls not to get pregnant by handing out condoms and teaching them about sex. But a study in the British Medical Journal found girls on the scheme were 'significantly' more likely to fall pregnant than other girls.
Two years ago a charity said masturbation techniques should be taught to children in sex education classes.
The Family Planning Association suggested that pupils should be shown explicit videos of masturbation at school - but family values campaigners said the proposal was nothing more than the promotion of pornography.