"As it turns out, even those six precious minutes may be more than our predecessors enjoyed. In his 1948 studies, Alfred Kinsey “found that 75 percent of American men orgasmed within two minutes of commencing intercourse,” Rachel Hills writes in her new book, The Sex Myth. “But more recent studies have reported a median time of between 5.4 and 7.5 minutes — suggesting that men may be adapting their sexual behavior to better fit the social ideal.” Today, she puts it wryly, “it is no longer acceptable for the sex act to end before one party has even begun.”
http://nymag.com/thecut/2015/09/how-long-should-sex-actually-last.html
http://nymag.com/thecut/2015/09/how-long-should-sex-actually-last.html