Multinomial logistic regression analysis was used to compare the three testing groups (Table 3). First we considered the comparison between men reporting zero or one test and those reporting two or three tests in the last 2 years. The two groups differed significantly on survey location and age. Those reporting two or three tests were more likely to come from the Scotland‐wide online survey and they were less likely to be aged > 36 years than ≤ 25 years. Those reporting two or three tests were also more likely to have had ≥ 10 sexual partners in the previous 12 months. Next we compared men reporting zero or one test and at least four tests in the last 2 years. Those reporting at least four tests were more likely to come from the Scotland‐wide online survey and less likely to come from the London survey or to be aged > 36 years. There were additional differences with respect to sexual behaviour: men reporting at least four tests were more likely to report having ≥ 10 sexual partners, ≥ 10 AI partners and an STI in the previous 12 months. There was no significant association with higher risk UAI. Finally, when comparing men reporting two or three tests and at least four tests, those reporting at least four tests were less likely to come from the London survey or be aged > 36 years and more likely to report ≥ 10 AI partners in the previous 12 months. Those reporting at least four tests were more likely to have higher risk UAI in the previous 12 months but this was of borderline statistical significance (P = 0.05).