Some teens chose not to use any forms of protection, such as condoms or birth control pills, some do not have enough money to get these things and other aren't educated, lots, if not almost all health classes aren't very good and don't give enough information about safe sex and childbirth/abortions or just tell students to remain a "virgin"
if you mean why it's because some don't were protection,protection fails, rapes,e.t.c\
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Sorry if I misunderstood the question
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