"About half of New Zealand 15-year-olds were sexually active..."
What is the source for that?
Some googling turns up this from the Ministry of Health,
"Studies suggest that by the time they reach 15 years of age, about 10–30 percent of New Zealand young people have had sexual intercourse....There is evidence that a sizeable minority of New Zealand teenagers have had sexual intercourse before they reach 16 years of age...A 1986 study of 15-year-old girls living in Wellington’s Hutt Valley found that 29 percent had experienced sexual intercourse (Lewis 1987). Just under 2 percent of the group had first intercourse a age 12, while 12 percent had first intercourse at age 15. A similar study of 16–19-year-olds attending an urban coeducational high school found that 22 percent of students were sexually active before age 16 (McEwan et al 1988). When assessed at age 15 in 1992, 8.5 percent of young people in the Christchurch Health and Development Study reported having had sexual intercourse at least once (Lynskey and Fergusson1993). Girls (10.2 percent) were more likely than boys (6.8 percent) to have had sex. A year later, at age 16, a quarter of the sample reported having had sexual intercourse (Fergusson et al 1994)."
Add to that information the latest research into the falling teenage birth rate finds:
"Delaying becoming sexual active among school-aged teenagers is an important factor in the declining teenage birth rate in New Zealand."According to the Herald on Sunday the researcher thinks the reason HPV vaccination rates are low amongst Pakeha is a belief that "white girls don't have sex".
That would be a stunningly stupid idea but exaggerating the incidence of it doesn't aid her cause.
Family First's Bob McCoskrie has also pointed to the following quote from the University of Auckland's The Health and Wellbeing of NZ Secondary School Students in 2012,
Approximately three-quarters of students have neverhad sexual intercourse. Twenty-five percent of malestudents and 24% of female students reported everhaving had sex