Fig 2.

Two-mode network diagrams for Melbourne and Sydney (upper and lower figures respectively). Square boxes denote ‘venues’ used for sourcing sexual partners (I, websites or mobile phone aps; II, sex on premises venues; III, mutual friends; IV, bars or clubs). Circles denote participants from Sydney (S) or Melbourne (M). Colours denote membership of a phylogenetic pair or cluster; grey indicates that the participant is not in a cluster; black indicates that the participant is not included in the phylogeny. Arrows indicate links between participant and venues; participants who provided only generic information about venues used (rather than naming a specific venue) are shown as unlinked.