According to this study, kids who went through the program were no more or less likely to do anything. Put another way, it would be impossible to tell, based on behavior, whether a student had been through this program or not.
Even more here, which includes this charming bit of spin:
On a call yesterday organized by the Abstinence Clearinghouse, abstinence-only proponents were clearly rocked by the potentially ruinous news in the report. High profile abstinence-only advocate, Robert Rector, led the preemptive damage-control planning. He outlined several strategies the abstinence-only movement could use to rationalize the findings in the report saying, “The other spin I think is very important is not [program] effectiveness, but rather the values that are being taught,” Rector said. Whether or not these programs work is a “bogus issue,” Rector continued.