From The Motley Fool:
Men trade 45% more women, and earn a net annual return of 1.4% less. Ha ha ha.
The authors cite increased trading costs, taxes, and a greater tendency to speculate as reasons for this underperformance.
http://www.fool.com/investing/general/2009/03/07/attention-single-men-stop-trading-so-much.aspx
But, don’t trade too little, because with today’s competitive environment companies come and go like yahoo. Long term (> 1 year) no longer means forever.