Advice
TeenHelp - http://www.teenhelp.org/
An international not-for-profit organisation who provide anonymous support and advice to anybody who needs it.
Teen Girls' Health - http://www.nhs.uk/Livewell/TeenGirls/Pages/Teengirlshome.aspx
Introduction to health articles and videos for teen girls. Includes sex for the first time, contraception, pregnancy, STIs, puberty, drugs, acne and bullying.