Official figures show 15-year-old girls are, on average, nine times more likely to catch chlamydia than boys their age.
And dozens of children – some as young as 13 – are being diagnosed with STIs in Greater Glasgow.
Eighty girls, aged 15, were forced to seek treatment for chlamydia in 2011, compared to 16 boys. The number of 15-year-olds diagnosed with the infection was 51 in 2012, of those, five were boys.