PEOPLE who skip breakfast tend to lose their virginity earlier, according to researchers in Japan.
In a study of 3000 people, those who did not regularly eat breakfast in their early teens said they lost their virginity at an average age of 17.5, versus an overall average age of 19 for all Japanese.
Those who had a morning meal when they were younger had their first sexual experience at 19.4 years.
The study, backed by Japan's health ministry, was aimed at finding ways to curb unwanted pregnancies. It concluded that a stable home life discouraged early sex.
"Those unhappy with their parents - such as for not preparing breakfast - may tend to find a way to release their frustration by having sex," said Kunio Kitamura, head of the Japan Family Planning Association who led the research.
"If children don't feel comfortable in their family environment, they tend to go out."
Young people who start having sex early tended to miss breakfast because they return home late, he said.
Japan has one of the world's lowest birthrates as more young people put off starting families, finding them a burden on their careers or lifestyles.
The survey also found that nearly 40 per cent of married couples had not had sex in more than a month.
Respondents said they were too tired because of work or found sex to be a pain, according to the study.

A lawyer married a woman who had previously divorced ten husbands.
On their wedding night, she told her new husband, “Please be gentle, I’m still a virgin.”
“What?” said the puzzled groom.
“How can that be if you’ve been married ten times?”
“Well, Husband #1 was a sales representative: he kept telling me how great it was going to be.
Husband #2 was in software services: he was never really sure how it was supposed to function, but he said he’d look into it and get back to me.
Husband #3 was from field services: he said everything checked out diagnostically but he just couldn’t get the system up.
Husband #4 was in telemarketing: even though he knew he had the order, he didn’t know when he would be able to deliver.
Husband #5 was an engineer: he understood the basic process but wanted three years to research, implement, and design a new state-of-the-art method.
Husband #6 was from finance and administration: he thought he knew how, but he wasn’t sure whether it was his job or not.
Husband #7 was in marketing: although he had a nice product, he was never sure how to position it.
Husband #8 was a psychologist: all he ever did was talk about it.
Husband #9 was a gynecologist: all he did was look at it.
Husband #10 was a stamp collector: all he ever did was… God! I miss him! But now that I’ve married you, I’m really excited!”
“Good,” said the new husband, “but, why?”
“You’re a lawyer. This time I know I’m gonna get screwed!”
London, March 4: Some Asian women in Britain are going to great lengths to fake their virginity, driven to desperation by concepts of 'honour' in a community where myths about their first sexual experience is still widely held, an Asian radio station reported.
If found to have sex before marriage, the lives of some young Asian women can be at risk and they can be driven away from their homes, experts and community workers told the BBC Asian Network documentary 'Like a Virgin', broadcast Monday.
As a result, desperate young women are using fake blood and even going in for reconstructive surgery to fake their virginity, the investigative radio documentary reported.
In an echo of social attitudes held in many parts of the Indian subcontinent, the programme found that most of the 17 to 21 year old men interviewed in the region of West Midlands - home to a large number of Asians - preferred women to be virgins at marriage.
Concepts of 'izzat' - or honour - are strongly held among some conservative Asian communities in Britain and have been linked not only to the practice of forced marriage but also, in some cases, the murder of young women.
An adviser formerly with the national sexual health charity Brook said she personally received requests for information on faking virginity on a daily basis from young Asian women - and that she provided the information because she feared for the safety of these women.
She said: 'They would sometimes come in to the centre because they were concerned about the fact that maybe they had had unprotected sex with a boyfriend and they were concerned about whether other men would know they had had sex before and were not a virgin.
'The discussions would then go around some of the myths around virginity... that girls bleed on the first time of having sexual intercourse. So we were able to say, 'lots of girls don't'.
'The problem is that lots of men and lots of people within the (Asian) community believe that that is true, and therefore they (young women) are very concerned that they will get married and they won't bleed and their husband will believe they weren't a virgin at marriage and all the problems that that would cause them in life.'
She said women were using red dye and mock blood that can be bought from novelty shops that they inserted into their vaginas or spread on the bed sheet after having sex. One Pakistani woman said she knew someone who had used a bottle of red ink - and got away with it. 'Her mother-in-law was very happy,' said the woman.
Underlining the seriousness of the issue, the adviser said she agreed to provide information on how to fake virginity because 'for some young women the risks to them and their personal safety were so great that if they were not able to fake it then the consequences could have been dire.''
A community worker who works with young Asians in west London said some girls have had to flee their homes and go into shelter 'because their life is on the line. Somebody may have found out'.
Linda Cardozo, a gynaecologist at Kings College Hospital in London, said some desperate Asian women were seeking reconstructive hymen-repair surgery, but that it was 'quite difficult to achieve' the repair because there may not always be enough tissues to bring together.
In any case, there was no guarantee that the woman would bleed.
'The main aim of hymen repair is to bleed on wedding night, but of course there are many women who don't bleed on their wedding night, whether they are virgins or not.
'This is because the hymen may be very stretchy, they may have used tampons for menstruation, they may have had lot of exercise and subtle tissues and therefore there are many women who have their first intercourse without bleeding at all.
'So there's no guarantee these women will achieve the aim they set out to achieve,' the doctor added.
Although some 24 such repairs had been performed in the state health sector, the vast majority of such surgeries are thought to take place in the private sector, which each surgery costs between 1,500 and 2,000 pounds. ($3,000-4,000)