Significant differences in the age patterning of the three surveys were apparent, with the highest proportion of young men (aged < 25 years) in the Glasgow/Edinburgh survey and the highest proportion of older men (aged ≥ 46 years) in the Scotland‐wide online survey. Participants in the latter survey had the highest mean age (37.8 years; SD 12.6 years), followed by the London survey (33.4 years; SD 9.5 years), while the participants in Glasgow/Edinburgh had the lowest mean age (32.3 years; SD 10.7 years) f(2) = 52.64; P < 0.001. The Scotland‐wide online survey also included a higher proportion of bisexual men. Men in the Glasgow/Edinburgh survey were least likely to report that they were employed, although the proportion with no education after age 16 years was highest in the Scotland‐wide online survey. Men in the Scotland‐wide online survey were more likely to have never tested for HIV, while testing in the previous 12 months was highest in the London survey. Significantly lower proportions of men in the Glasgow/Edinburgh survey reported ≥ 10 sexual or AI partners in the previous 12 months, but the difference in the proportions reporting any UAI between the surveys was borderline significant. The London survey sample was most likely to report having had an STI in the previous 12 months, but the proportion reporting higher risk UAI was highest in the Scotland‐wide online sample.