Sex in zero online
The PARTNER study is important in that it included both gay and straight couples, that it measured risk in people who were not using condoms and that it estimated absolute risks.
Previous studies have almost exclusively been conducted in heterosexual people who still reported high rates of condom use.
This makes summarising results complex, but the median age ranged from 40 to 44 (with IQR overall ranging from 31 to 50 years).
Gay men and HT women were a few years younger than HT men.
This reverses the common assumption that, by definition, some level of risk always exists when one partner is HIV positive.