Nineteen percent responded similarly regarding penile-anal intercourse. The degree to which individuals vary with respect to the behavioral criteria involved in labeling an interaction as having "had sex" has implications for both clinical and research purposes. Recent public discourse regarding whether oral-genital contact constitutes having "had sex" highlights the importance of explicit criteria in contrast with implicit assumptions in this area. Unfortunately, a review of the literature demonstrates that empirical exploration of what is included in definitions of having "had sex" for the general public in the United States remains scant.

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Back to Sexual health. Find out the things you need to ask yourself if you're thinking about having sex. Most people have sex for the first time when they're 16 or older, not before. If someone's boasting about having sex, it's possible they're pretending.