Upskirting is now a criminal offence in England and Wales after a campaign by a woman targeted at a music festival.
Offenders will face up to two years in prison for taking an image or video under somebody’s clothing in order to see their genitals or underwear.
Gina Martin, who led the calls for change, said she hoped the change in law would help people “feel comfortable” to report such crimes.
It is already a specific crime in Scotland but not in Northern Ireland.
Speaking on the day the law came into effect, Ms Martin called on people to report upskirting when they see it happen.
She told BBC News: “If a new law’s there, great – but if we don’t know about it or aren’t reporting it, [then] it doesn’t do anything.