Understanding the diverse sexual repertoires of men who have sex with men, trans and gender-diverse groups is important for sexually transmitted infection prevention

The sexual repertoires of men who have sex with men (MSM), transgender (trans) and gender-diverse groups are poorly understood despite their disproportionate rates of sexually transmitted infections (STIs). The interrelated landscapes and syndemics of the social and sexual behaviour of MSM, trans and gender-diverse groups, and transmission of STIs have changed beyond recognition over the past 20 years.1–3 We are only beginning to understand the complex and evolving sexual behaviours of MSM in mainly urbanised Western populations such as described in the article by Kilner et al.4 The majority of our understanding of sexual behaviour in the trans population comes from studies of trans women, with much less being understood about trans men and almost nothing about non-binary or other gender-diverse people.5 Little is also known about the sexual behaviours of sexual orientations such as pansexual or individuals who mainly have…

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