HOUSTON - Abstinence-only sex education programs, a major plank in President George W. Bush’s education plan, have had no impact on teenagers’ behavior in his home state of Texas, according to a new study. Despite taking courses emphasizing abstinence-only themes, teenagers in 29 high schools became increasingly sexually active, mirroring the overall state trends, according to the study conducted by researchers at Texas A&M University. “We didn’t see any strong indications that these programs were having an impact in the direction desired,” said Dr. Buzz Pruitt, who directed the study. The study was delivered to the Texas Department of State...