"We need to really think about how we work to engage men and boys in issues around gender equality," Fanslow said.
"It's a really big problem that has a really big fallout, and if we're not happy about that we actually need to do something to change it."
Although there were examples of countries overseas taking preventative measures in education and other areas, New Zealand had lagged behind in taking a largely punitive approach to sexual offending, Fanslow said.
The research relied on a 2003 survey of 2855 women in Auckland and Waikato, and a 2019 study involving 1464 women in Auckland, Northland and Waikato.
The women were asked about their experiences of sexual abuse.
Where to get help
NZ Police
Victim Support: 0800 842 846
Rape Crisis: 0800 88 33 00
Rape Prevention Education
HELP Call 24/7 (Auckland): 09 623 1700, (Wellington): 04 801 6655 - 0
Safe to talk: a 24/7 confidential helpline for survivors, support people and those with harmful sexual behaviour: 0800044334.
Mosaic - Tiaki Tangata Peer support for males who have experienced trauma and sexual abuse: 0800 94 22 94