Sex education charity Marie Stopes International has teamed up with Durex and teenage magazine Sugar to send out 20,000 free condoms to children aged between 11 and 15.
The current issue of Sugar contains the results of a NOP survey by Stopes, which shows that half of children between those ages don't know that condoms can protect against HIV and sexually transmitted diseases.
Readers are invited to look the at Stopes web site, www.likeitis.com, which gives details of the offer - a card with the condom attached.
Applicants get one condom and it takes 28 days to arrive. The charity received 50 applications in the first two hours of the offer last Friday, said Caroline Elliott, assistant communications manager at the charity.