Bob, 22 It was probably in primary school where they asked us to think of as many words as we could to describe genitals. We all went nuts and thought of as many weird things as we could. Other than that, I guess it was also those really dodgy cartoon strips showing people 'doing it'. The best part of that was when you flicked through them really fast - hilarious!

Katie, 17 We had sex education at school and it wasn't bad, but it was probably magazines like Cosmopolitan that taught me the most. I also found out a lot from my friends, but certainly not from my Dad!

Oliver, 24 I once saw one of my best mates having sex in a park while I was playing football, so that was a big eye-opener. I always wondered why people don't always know a lot about sex, considering it's the first thing you learn about when you're 10 or 11. Then you start asking each other all sorts of silly questions. My parents wouldn't actually let me have sex education at school. I eventually found out about everything without too much embarrassment.

Kelly, 18 I probably had my best sex education at secondary school, or from my friend Tim. He refers to himself as my sex teacher!

Hannah, 16 I'm not really sure what's been the best sex education I've had so far. I've probably learnt most through school, but other than that I guess just from hearing other people talking about it.