Fig 1. Possible pathways for patients offered the survey, and the classification for analysis of nonconsensual condom removal.

Abbreviations: MSM = men who have sex with men; CASI = computer assisted self-interviewing. ^aParticipants were classified as never having experienced stealthing if they responded either: 1) they had never had a condom removed during sex, 2) that a condom had been removed with permission, or 3) that a condom was removed without permission but they willingly continued sex. ^bParticipants were deemed to have experienced stealthing if they reported: 4) condom removal without permission and sex continued unwillingly, 5) condom removal without permission and sex was discontinued, 6) condom removal during sex but they did not realise until afterwards, or 7) the condom was never put on despite being requested.