A 2006 study that analysed the Toledo Adolescent Relationships Study found that more boys report having non-dating sexual partners than girls. Of this sample, a third of boys only have had sex with their romantic partner, another third of boys who have had sex with a partner they are not dating within the past year are believed to wish for the girl to be their girlfriend. Many young adults are more likely to engage in sex with romantic partners than with casual acquaintances or "friends with benefits."