In Harry Fisch’s new book The New Naked: The Ultimate Sex Education for Grown-Ups, he reports that 45 percent of all men finish having sex within two minutes of engaging intercourse. This is a 30 percent decrease from what sex researcher Alfred Kinsey found in his sex studies of the 1940s and 1950s, so that’s good.
But The New Republic additionally reports that a 2004 paper in the Journal of Sex Research suggests that heterosexual men may mind their short endurance time more than their female counterparts, as men tend to idealize themselves lasting a longer amount of time than women do.
Sadly, a 2009 paper in The Journal of Sexual Medicine has correlated a longer duration of sex with more women achieving orgasm.
No word yet on how much this applies to gay men and women. Although a 2011 study on gay and bi men's sex lives over an entire lifespan did yield plenty of interesting finds.