The correlation only holds with porn depicting unprotected anal sex. The author of the 2013 study, epidemiologist Simon Rosser of the University of Minnesota, notes that watching porn in general - even watching a lot of it - doesn’t increase the risk of having unsafe sex.
It, too, described a dose-response relationship between watching and having unprotected anal sex among gay and bisexual men. It echoed a similar study, also funded by the NIH, that was published in 2013.
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