A new campaign, which has among its key aims empowering young people to delay their first sexual experience, is being launched on Monday.
The campaign will also promote safer sex
The Health Promotion Agency for Northern campaign is entitled 'Think it through'.
Its chief executive Brian Gaffney said the pressure felt by young people to have sex was not based on fact.
"There are a lot of misconceptions about young people's sexual activity in Northern Ireland," said Dr Gaffney.
"Many young people are not in a sexual relationship, and in fact previous research has shown that almost two thirds of those under 17 haven't had sex.
"A large proportion of those who had sex before the age of 17 felt they had sex too early and at this age, sexual activity tended to be unplanned, with alcohol often a factor."
Dr Gaffney said one in four young men and one in three young women in Northern Ireland said they were drunk the first time they had sex.
The 'Think it through' campaign will include radio advertisements and posters, which will be displayed in toilets of pubs and clubs across Northern Ireland.