Emma, 19, from Wigan
"Where I live, people have sex at quite a young age - I was about 14 or 15. The first time was with a boy I knew really well. We were really good mates. We all got drunk one weekend and it kind of happened. I fancied him, and I thought if I slept with him he'd be my boy-friend. But of course that never happened.
"I was happy that I'd done it because I got it out of the way. But then boys think you're a bit of an easy target. At that time everyone was just sleeping with someone different every weekend. We might be out hanging round the streets, and then we'd go off with someone. When I was 16 I started clubbing and I was meeting lads who were in their 20s. If someone showed an interest, most girls would be like, 'Yeah, I'm going to go off with him tonight.'
"I used condoms quite a lot, but not always. Then I met a boy, and in the heat of the moment we didn't think about it. It was the first time I slept with him, and I got pregnant. I was 17 then. He wanted to be a dad, but he was going out sleeping with other girls. We split up before my little girl was born.
"I haven't heard of daisy-chaining. Round here they just call it gang-banging. Everyone's at it. Most girls are up for it. I have friends who come in and tell me what they've been up to, so I know it's true. Sometimes it's one girl and a few lads, sometimes a bit of both.
"In school we never learned anything. They just showed us a video about abortion, called The Silent Scream. I just sat there and cried. Then they turned off the video and that was the end of the lesson. As soon as my little girl starts her periods I'm going to get her on to the pill."
James, 18, from the Midlands
"At my school we had quite good sex education, probably from when we were 13. I had girl friends when I was younger, but we didn't have sex. I was interested in my work and stuff like that. We'd go to the cinema, or just socialise in the park.
"We were always sensible. And I felt really supported by my friends. Sometimes when we felt like sex could have happened, we tried to prevent it. We tried to make sure we were around people so it wouldn't be an option.
"At 16, I became a peer educator on sexual health, so it would have been a bit hypocritical if I wasn't sensible myself.
"I've been with my girlfriend two years now. We first had sex last year, when we were 17. We've seen each other grow, and we support each other. It just feels right that we carry on together without getting too serious. We're both going to university this year.
"I don't think there used to be enough support for teenage mothers but I think it's got better. I think young people prefer to get information about safer sex from youth clubs and health advisers. School is too close to home."
Robert, 20, from London
"I was about 12 when I first had sex. It was with a girl who was my mum's friend's daughter. She was a year older. She just kind of showed me things. And I was thinking, 'This is different.'
"It wasn't like I'd seen in the films because I was more shy. I didn't talk to my friends about it. I kept it to myself for a while. Then when someone else started talking about it, I'd talk about it too.
"I didn't have a girlfriend as such till I was about 16. But I had sex quite a lot. I'd meet girls through school, or playing out. Then you'd bring them to someone's house. Some people's parents work late, other people's parents stay in their room.
"I didn't think about getting a girl pregnant. I was lucky - until now. My girlfriend is three months pregnant. We've been together about a year. I don't think we're too young. My mum had six kids, the first when she was 18. I don't think it will hold me back. My girlfriend's in a hostel, and they're putting her in temporary accommodation. We'll probably get a place together eventually.
"I didn't know what daisy-chaining was until today - I heard it on the radio. I think there are different names for it. Round here they call it run-battery. I think it's because if you have more than one battery, then when one runs out another can take over. It doesn't appeal to me at all. Me and two girls, now I'd think about that.
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Elaine, 19, from the Midlands
"I didn't really talk to my parents about sex. They told me some stuff, not a lot. But it was quite easy to talk about it with my friends. There were people at school who lost their virginity when they were 14 or 15, but most of my friends were religious so we waited till we were older. I wasn't brought up Christian, so I looked at it from the point of view that when I was ready that would be OK.
"I went to a mixed sixth form college, and I met a lad I got on with through my friendship group. We were friends for about a year before we started going out. Then after about another three months we slept together. You just kind of know when it's right.
"We talked about it, and we talked about what precautions to take. My boyfriend came along with me to the family planning before we had sex. We said we were thinking about having sex, and they told us how to be safe and what to use. There was none of that, 'Well, you don't really want to be doing that.'
"If I could change anything, I think it would be what they told us at school. They didn't tell us about sexually transmitted infections. I didn't know what chlamydia was until I was 16 and I read a leaflet in the youth club. They just told you, 'Don't get pregnant because if you get pregnant when you're a teenager your life's over.'
"Since then I have become involved with a project called the Kiss project, which is doing mentoring in schools. They train young people so they can go and talk to others."
Laura, 21, from Newcastle
"I became sexually active when I was 15. I used to go out every weekend, and I'd kissed this boy in a club the previous week. Then we met up again and we slept together. It sounds really sleazy now.
'That was it, I didn't see him again. I wasn't crying or anything like that but I didn't feel good about it. I was a little bit promiscuous until I was 17, but then I realised I wanted to have more respect for myself. I didn't have any proper relationships when I was younger. It was mostly one-night stands - a friend of a friend, rather than just some random person. I hoped for it to lead to a relationship. But now I think that's because I was naïve.
"The lads I was sleeping with were 17 to 19 year olds, and they weren't looking for a relationship. My friends and I had all these big crushes on boys. At the end of the day, we really wanted to have a boyfriend.
"I met mine when I went to university and we've been together now for three-and-a-half years. Before I slept with him I had all the tests done for sexually transmitted infections. I felt I had a responsibility to check that I wasn't going to pass anything on to him. We both went for a check together, and that was fine."