http://askthejudge.info/is-providing-contraceptives-at-school-promoting-sex/158/

great article and I honestly don't think it will change their behavior because getting into that 13-14 year old age the hormones start going and kids start exploring.  The good safe guard is that they have to have parental consent to obtain the pill.  But if you think about it there is no age limit on buy condoms.