Men are less likely to talk than women with 54% of women having had a conversation compared to 37% of men.
CCTV Cameras In London Schools
More than 200 schools, including 25 in London, are using CCTV cameras in toilets or changing rooms.
The figures have been published under a freedom of information request by Big Brother Watch.
There are now more than 100,000 CCTV cameras in secondary schools and academies across the UK.
The campaign group believes the research raises serious questions about the privacy of schoolchildren.
A Department for Education spokesman said: "We have already acted to make it unlawful for schools to use biometric data like fingerprints without parents' permission.
"CCTV can be beneficial in some cases but this is a decision that head teachers should take.
"Schools using CCTV are required by law to adhere to the Data Protection Act."
A career in the media and entertainment industry starts here...
A man has been fined £1,800 for flying drones over Parliament, near Buckingham Palace and over football stadiums.
Government to investigate after some restaurants accused of withholding tips
Most Viewed Pictures On Heart
Recently Played Tracks
6am - 9am
Now playing: The best feel good music
Deposit £10 to get a £40 Welcome Bonus - That's £50 to play bingo, slots and more!*
Over 50 tracks to make you feel-good. New album out now...
Find your local four day weather report here.
What's happening on the roads where you are?
Make Heart the soundtrack to your day and you could be a winner with great prizes up for grabs throughout the day.
Get some great ideas on how to advertise your business on radio, online and on mobile.