Quote:
found one in 13 teenage girls reported having a 'multi-person sex' (MPS) experience
...
The study, of 328 girls from deprived areas in Boston who had gone to sexual health clinics
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So the author assumes that teenagers who go to the free clinic in specific parts of Boston are representative of average teenagers?
Sounds like a more accurate headline would be:
25 teenagers who have sex parties in one area end up at free clinic.