Misclassification bias: diversity in conceptualisations about having 'had sex.'.

The article presents a study conducted in Indiana which examined attitudes about which sexual behaviours constitute having had sex and analyzed the possible mediating factors such as gender, age, giving/receiving stimulation, male ejaculation, female orgasm, condom use or brevity. Attitudes about giving and receiving manual-genital (MG) or oral-genital (OG) stimulation are also analyzed, as well as whether penile-vaginal intercourse (PVI) and penile-anal intercourse (PAI) constitute having had sex. The oldest and youngest age groups were less likely to believe that certain behaviours constituted having had sex.