http://www.telegraph.co.uk/earth/main.j ... idir24.xml
A study at Warwick has showed that in a task akin to reading a map, heterosexual men outperform gay men, who outperform lesbian women, who outperform heterosexual women.
That may explain some recent runs for some people

The same study showed that ability declines with age, but faster for men than for women (which may explain some of my recent runs)
