What “Counts” as first sex between women? Results from a study of first sex among women who have sex with women
Bibliographic record
Abstract
First sex is most often defined by first penile-vaginal intercourse (PVI) among cisgender heterosexual individuals or first anal intercourse among cisgender men who have sex with men. The importance given to penetration and PVI as the markers of first sex has contributed to the invisibility of women who have sex with women’s (WSW) sexualities. Eighty-four WSW aged 16 to 25 years ( M = 21.96 years, SD = 2.44; 79% cisgender) completed an online survey wherein they categorized a series of partnered behaviours as either (1) non-sexual, non-markers of first sex; (2) sexual, but non-markers of first sex; or (3) sexual and markers of first sex. Results from a non-linear principal component analysis show that there is no equivalent to PVI for first sex among WSW: direct anal or genital stimulations (either given or received; internal [e.g., vaginal, anal] or external [e.g., clitoral, vulvar]; from digital or oral stimulation, or from using toys) are categorized as markers of first sex. Behaviours such as heavy petting, caresses, and indirect genital stimulations are categorized as sexual, but non-markers of first sex. Behaviours that do not involve genital contacts, such as strip-tease or massages, are categorized as non-sexual. Triangulation with qualitative findings from the same study shows high convergence between quantitative and qualitative data in that direct genital stimulations are markers of first sex for WSW. Together, these results highlight that direct anal stimulation and the use of sex toys would be considered markers of first sex when part of WSW’s early sexual encounters.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.005 | 0.032 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.002 | 0.002 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.003 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".