Educational references for the research described above. They do not endorse this article, and they do not replace individualized advice.
Note on the evidence base: most of this research is Western, biomedical and psychological, and much of it centers on cisgender women's experience of penile-vaginal intercourse. It does not adequately cover obligation-based or collectivist sexual values, disability-justice perspectives, or pain in anal sex — and prevalence estimates vary widely with who is asked and how (in a systematic review of one country's studies, dyspareunia prevalence ranged from 1.2% to 56.1%). Treat any single number as context, not precision.
Scope: the red-flag list above is educational guidance on when to stop or seek evaluation — not a diagnosis and not a treatment recommendation. This article triages pain during partnered sex; it does not enter conversations about traditions in which enduring pain is an explicitly shared value.