Figure 1. Venn diagram for overlap of exposures (frequent receptive fisting without gloves, frequent anal bleeding, group sex & consumption of NADs).

*Unexposed: Respondents who neither had been frequently fisted without gloves (or with gloves that were shared), nor frequently experienced anal bleeding when having sex, nor reported group sex activities plus consumption of NADs. The circular areas correspond with the respective presence of exposures; intersecting areas reflect only roughly the given percentages.