While those who pride themselves on living in a reality-based world may feel validated to know that the Guttmacher Institute just released a study saying that 95% of Americans engage in pre-marital sex and that those findings are pretty consistent going back to the 1950's, not only does it not end debate on sex-education vs. abstinence only education, it only intensifies the debate. 

Why?  Because no amount of facts or statistics will overcome the people pushing abstinence-only programs and to the extent that they do take the statistics at face value it only reinforces their conviction that our society is sick and immoral and someone needs to change that, so why not both preach and institutionalize abstinence.  Remember this whole thing is not about what real people are doing in their real lives, its about what someone else thinks they should be doing.