Eight out of 10 men would bed an attractive stranger if she offered them no-strings sex, but women are much pickier if they are propositioned by blokes, scientists have claimed.

In an experiment, the scientists found that when men were approached by gorgeous female strangers in the street, 97 per cent agreed to go back to their apartments while 83 per cent said yes to instant sex, the Daily Star reported.

However, when average-looking girls asked the question, 80 per cent of blokes agreed to go back for a drink while 60 per cent immediately agreed to a romp.

But when men propositioned women only one of the 120 girls agreed to sex.

Scientists say the findings are more proof of the difference between the sexes.

"Men are apparently more eager for sexual activity than women are," the Daily Star quoted French psychologist Nicolas Gueguen as saying.

"Men were more willing to go to an unfamiliar female's apartment and to sleep in an unfamiliar female's bed than females were in response to the same two propositions," he stated.

The results of Dr Gueguen's study have been published in the journal Archives of Sexual Behaviour .