Changes in recreational drug use, drug use associated with chemsex, and HIV-related behaviours, among HIV-negative men who have sex with men in London and Brighton, 2013-2016.

Sex Transm Infect · 2018 · PMC6227813 · PMID 29700052

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an increasing trendno p-value reported

While the effect of wider access to PrEP on sexual behaviour and recreational drug use is yet unknown, our results show an increasing trend in certain measures of HIV-related behaviours and polydrug and recreational drug use in a context where PrEP is not freely available.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.