Can't speak for my local Planned Parenthood, but their website certainly has a lot to say about abstinence.
The first article in their teen sections is on abstenence.
http://www.plannedparenthood.org/teens/
And the first type of contraception they list is abstinence.
http://www.plannedparenthood.org/bc/
As far as publi school curriculums, if they need information on abstinence, I'm sure planned parenthood would help them out. They can order the following resources from the planned parenthood website.
http://store.yahoo.com/ppfastore/sexuality.html
Teensex? It's OK to say "No Way!"
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It's one thing to tell kids to "just say no" to sex - Planned Parenthood educators know that for abstinence to be a real option for teens, they need specific motivation and communication skills. They need to know how to face peer pressure and the powerful emotions that come with their first romantic relationships. This popular publication gives kids that information in an appealing style that they find reassuring. Its comic book format plays out many of the scenarios young people will confront. It refutes the myth that "everyone is doing it" or that you have to be sexually active to be cool. Its 4th-grade reading level makes it accessible to teens at all levels and those whose first language may not be English.
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Is Abstinence Right For You Now?
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This easy-to-read pamphlet explains what abstinence is; why people choose to be abstinent; how to stay abstinent; and how to talk about abstinence and set limits with sexual partners.[/font]