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Around one percent of the world's population are 'asexuals' who feel no sexual attraction at all, experts have claimed.

A leading academic has suggested that the sexualisation of our culture has turned people off sexual feelings, to the extent that millions do not have physical attraction to others at all.

Claims that one percent of the world's population are asexual would mean that 70 million people on Earth feel no sexual attraction.

A book to be published next month even suggests that the growing number of asexuals should be classed as a 'fourth sexual orientation'.

Professor Anthony Bogaert believes that asexuals are 'under-studied' and that they can feel excluded from our 'very sexualised culture'.

Experts say a certain number of asexuals may have always existed but are only now starting to 'come out' as society becomes more liberal.

Professor Bogaert said society can place expectations on both sexual and asexual people.

He defines asexuality as a complete lack of sexual attraction.

Prof Bogaert, an associate professor at Brock University in Canada, said: 'There are two forms: people who have some level of sex drive, but don't direct this drive toward others (so they may masturbate); and other people who have no sex drive whatsoever.'

In 2004, Prof Bogaert analysed the responses of 18,000 people in the UK to a 1994 survey on sexual attraction.

He found that one percent agreed with the statement: 'I have never felt sexually attracted to anyone at all.'

His book to be published next month, Understanding Asexuality, analyses asexuality further, arguing that greater numbers of people now consider themselves 'asexual'.

Some asexuals may have extremely low sex drives but others have normal sex drives and are simply not attracted to others, according to a previous New Scientist report.

Some still want to form close and lasting emotional bonds with other people and may even want to have children by using IVF to avoid having sex, the magazine reported.

(Read by CJ Henderson. CJ Henderson is a journalist at the China Daily Website.)

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(Agencies)