don't know about that.....read another study awhile back that said the same thing.....the stats don't bear out why this occurs.....just like when I was young and told my parents I wouldn't go out and drink.......right???? and I grew up in a very Christian home but when you're young peers, hormones, whatever pull you in alot of different directions........don't put much faith though in any casual relationship
A previous study showed that teens who had pledged abstinence waited a bit longer to have sex, but that when they did (which they did at the same rates as those who had not taken any such pledge), they were much more likely to be "unprepared" -- i.e. no contraceptives, including STD-reducing condoms.