Why are the teenage pregnancy rates so high in the UK?

Why do YOU personally think the teenage pregnancy rates are high in the UK?

Sorry if this is in the wrong section :S
Update: Mature answers only please lol
Update 2: @emberfly - No offence, but you said you live in the US. You wouldn't see a pregnant teen in the UK because you don't live here. Sorry if that sounds rude, hope you're not offended
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