no sexual contact.
The study, which is considered one of the largest of its kind, is based on interviews conducted between 2006 and 2008 of about 5,300 young people in the aforementioned age range.
Unfortunately it's difficult to explain exactly what caused this trend as surveys before 2002 were not as extensive. However, the data regarding vaginal sex among never-married young people has shown a steady decline since the late1980s. This is consistent with other research that has shown a drop in teen pregnancy.
Since the trend began in the 1980s, some believe this negates the impact of abstinence only sex ed programs which began to be heavily emphasized during George W. Bush's presidency. Others think it has more to do with the hyper awareness teens have of STDs and the impact of teen pregnancy. These finds are particularly interesting considering the much publicized fears over the last decade that the rise of free internet porn has had a negative impact on the relationships and sexual habits of young people.
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