It is true that men spends more waking time thinking about sex than women, but both genders dream about the subject in equal measure once the lights are out.
According to a first of its kind survey in four decades, the canadian research team report that about 8 per cent of everyday dream reports from both genders contain some form of sexual-related activity.
Professor Antonio Zadra from the University of Montreal psychology presented his findings on Thursday at Sleep 2007, the annual meeting of the Associated Professional Sleep Societies in Minneapolis.
He examined more than 35,000 dream reports from 109 women and 64 men.
In a sharp contrast from the earlier researches conducted in the 6o's where it was found that men had twice many more sex dreams than women.
Men's sex dreams were twice as likely to involve trysts with multiple partners, and were more likely to take place in public.
Women were twice as likely to dream about sex with public figures, according to the researchers.
The most common type of sexual dream content was sexual intercourse, followed by sexual propositions, kissing, fantasies and masturbation.
Other under-the-cover revelations:
• Both men and women reported experiencing an orgasm in about 4 per cent of their sexual dreams.
• Women reported that orgasms were experienced by other people who figured in their dreams, in about 4 per cent of their dreams.
• In contrast, men did not report other characters experiencing orgasms in their dreams.
• Current or past partners were identified in 20 per cent of women's sexual dreams, compared to 14 per cent for men.
• Public figures such as movie stars and politicians were twice as likely to be the object of women's sexual dreams, while men were twice as likely to report dreaming of multiple sex partners.
"Observed gender differences may be indicative of different waking needs, experiences, desires and attitudes with respect to sexuality," Zadra said in a statement.
"This is consistent with the continuity hypothesis of dreaming which postulates that the content of everyday dreams reflects the dreamer's waking states and concerns - that is, that dream and waking thought contents are continuous."
Lovers past and present turned up in 20 per cent of the women's dreams but only 14 per cent of the men's dream sequences. In their fantasy worlds, the men almost never had to put their ego on the line and come on to a woman. In about 90 per cent of the erotic dreams they logged and reported to investigators, the women made the first move.