Sex education in schools...?

Recently there have been ads attacking Obama for wanting to put sex education in schools. This is going on his voting record when he was in Illinois senate.

palin's children obviously need this, i know many of you have stated her daughter is an adult at 17 ; i'm 28 and barely feel like an adult no 17 yr old is an adult. i'm sure her 17 yr old lives on her own and pays her own bills.

1) why is this a bad thing?

2) is teaching abstinence failing our kids?

discuss.