So, in order to find out if women in these experiments were held back by fear, they designed an elaborate cover scenario designed to make the participants believe they could accept offers of sex without fear of anyone finding out, or of physical danger. Participants were invited into a lab under the ruse that they would be helping a dating company evaluate their compatibility rating algorithm. They were presented with ten pictures of members of the opposite sex and led to believe that all ten had already agreed to meet up with them (either for a date, or for sex). With these, and a few other convincing details, the experimenters hoped that participants would reveal their true attitudes to dating, or hooking up for sex with, total strangers, unimpeded by fear of what might happen to them if they said yes.

The results were dramatic. Now there was no difference between the dating and the casual sex scenarios, large proportions of both men and women leap at the chance to meet up with a stranger with the potential for sex – 100% of the men and 97% of the women in the study chose to meet up for a date or sex with at least one partner. The women who thought they had the chance to meet up with men for sex, chose an average of slightly less than three men who they would like to have an encounter with. The men chose an average of slightly more than three women who they would like to have an encounter with.