“Women have a right to explore their sexuality in the same way that men do,” she adds.Porn may be more accessible than ever before, but women’s interested in dude-on-dude action is actually nothing new.
"However, women with the same sexual attractions, but less favourable heterosexual options might have greater opportunity to experiment with same-sex partners." But for men, higher levels of education were associated with a lower likelihood of identifying as "100 per cent heterosexual", while physical attractiveness had no clear association with sexual identity.
Dr Mc Clintock said: "Men are less often attracted to both sexes. If a man is only attracted to one sex, romantic opportunity would little alter his sexual identity." The study also found that women were more likely to change their sexual identities between the ages of 22 and 28.
Dr Mc Clintock found that women were more likely than men to report bisexuality.
Because, while 'lesbian porn' has long done a roaring trade among straight men, it seems a growing number of women are turning to man-on-man action to get them going.
"Some gay men might find this problematic, but for me it's all part of the flexibility and creativity of desire.