WASHINGTON (Reuters) - Programs teaching U.S. schoolchildren to abstain from sex have not cut teen pregnancies or sexually transmitted diseases or delayed the age at which sex begins, health groups told Congress on Wednesday. The Bush administration, however, voiced continuing support for such programs during a hearing before a House of Representatives panel even as many Democrats called for cutting off federal money for so-called abstinence-only instruction. "Vast sums of federal monies continue to be directed toward these programs. And, in fact, there is evidence to suggest that some of these programs are even harmful and have negative consequences by not providing adequate information for those teens who do become sexually active," Dr. Margaret Blythe of the American Academy of Pediatrics told the committee. http://www.reuters.com/article/scienceNe...