indeed, Atheist, sports were pretty much invented by men for men (typically for training soldiers, I suspect, though cricket was for bored shepherds and rugby for public schoolboys to let off steam).
Women's events have been permitted for some time as a gesture to the weaker sex - I believe they can compete on equal terms in diving and equestrian events but not much else. And athletes with a mixed range of disabilities now have Paralympics. I don't know how much more niche we can get, though.