Except that the evidence is abundantly clear that abstinence-only sex ed is what is causing this increase in STDs among teenagers. Let’s look just at the state of Texas, which leads the nation in abstinence-only sex ed. 94% of all Texas school districts teach abstinence-only sex ed, with only 3% teaching abstinence-plus (abstinence plus condoms and other forms of birth control). The result? Texas teenagers also are among the nation’s leaders in unprotected sex. Fifty-sex percent of high school students in Texas report having used condoms at last intercourse. Only three states have lower rates of condom use among students.