This website may provide you with some useful classroom ideas, but it's more of a resource for the teens themselves. Too often they are bombarded with false information, learning from magazines, blogs and each other. Offer them this and you know they will have access to honest and accurate information with the click of a button in the privacy of their own homes.
It isn't all about Sex. Teaching teenagers how to build positive and trusting relationships is a key part in teaching them healthy sexual behaviours, in fact the positive relationship part should come first. This article offers useful insights into teen relationships, from there you can alter your sex education lessons accordingly.
This is one of my absolute favorite teaching strategies when teaching sex education. By having an anonymous question box students can ask anything they want without feeling embarrassed by their peers. As a teacher you can incorporate the questions into your lesson or read and answer them directly, all with the time and preparation needed to give a thorough and informative answer.
This (rather British) clip was created by the Thames Valley Police who decided to tackle the issue of sexual consent by comparing sex to tea! It hits the nail on the head regarding consent. It's simple and silly, and I have had to show it to pupils a few times to ensure the message gets across through the tears of laughter, but the fact they still talk about it means something must have sunk in.
When teaching Sex Education you can often be the first teacher to notice any warning signs of unhealthy sexual behaviour. Use this traffic light themed guide as a supplementary resource and be able to offer help and support to your students. You do need to create an account with the Guardian Teacher Network to access this resource, but it's free and easy.
This talk by Al Vernacchio (aka Mr V) can be shown directly to pupils as it is or watched as inspiration for your own lessons. I particularly like his ideas about teaching sex education with pizza analogies and have found it very useful in the classroom - the perfect mix of silly and serious.