They are the kind of vices it is traditionally assumed teenage boys will exaggerate and girls underplay.
But according to a major new international study, British teenage girls not only have some of the highest rates of under-age sex and drunkenness in Europe but are even outdoing boys.
According to the four-yearly report published by the World Health Organisation, 15-year-old girls in Wales are more than 50 per cent more likely to say they have had sex than boys of the same age.
In England girls are 28 per cent more likely than boys to give the same answer while in Scotland the gender gap was narrower but still noticeable.