Women lack humour.

Men are funnier than women?
Oh no they're not! Oh yes they are! Or are they?http://news.independent.co.uk/sci_tech/article3276235.ece
and
http://news.bbc.co.uk/2/hi/health/7153584.stm

Apparently when Prof Shuster ( a dermatologist) unicyles around his town, more men than women make comments, and more younger men than older ones. Men's comments are usually humorous ( or jeering) such as "Lost yer wheel, mate?" "Couldn't you afford the other one?" and similar gems. Women are more admiring and encouraging.The prof puts this down to the fact that the young men regard him as a rival in the sex stakes, and to cover their aggression, use 'humour'. From this , according to the articles quoted, he makes the equation testosterone = humour.The humour involved is hardly startling or original, and not terribly funny in my opinion. Of course, as a 60-year-old female, I guess I lack the requisite testosterone to appreciate or make such jokes.