    “Séntenée4* Teenagers ‘ at” high Schools-.whére:  ‘condonts were available were.rio nigre likely.to have  ‘Sex than other teens , a study published Wednesday  finds :    ‘Sentence 2:. Teenagers. at’ high schools where  ‘eoridoms-are available” are no: more. fikely. to, have  86x than other teens ,-a'study says."         