A new survey has found that atleast 50 percent of the teens that attend the school leaver’s celebrations will indulge in some form of sex. The survey also found that oral sex is on the raise in these celebrations.

WA AIDS Council said that there is often a 100 per cent rise in sales of the morning-after pill where such festivities take place and a number of leavers catch sexual diseases there.

"At least half the (leavers) will be engaging in sexual activity. That can be from petting, right through to intercourse, and even engaging in experimental behaviour with two or three people,” News.com.au quoted Gareth Merriman, Curtin University senior lecturer in sexology, as saying.

"Girls are engaging in oral sex at a much younger age to find out if their boyfriend really loves them - of course there's no connection between the two. "But the dilemma with leavers, or anything involving high excitement, drugs and alcohol, is... some of these people will be too intoxicated or under pressure, and will regret (their actions) the next day,'' Merriman added.

Michael Carr-Gregg, a child psychologist, said there had been an increase in sexual practices among teens copied from Internet pornography, and leavers' celebrations were no exception. "Things like group sex have become quite popular and that would simply not have happened a couple of years ago. And for a lot of young people, sex is now all about pleasuring the male, and I think that's very sad.'' Dr Carr-Gregg said.