http://news.bbc.co.uk/2/hi/health/3111718.stm

Women may have just been given carte blanche to complain after a night on the tiles, as scientists in America have decided that women suffer from worse hangovers than men.

so basically these scientists have 'discovered' that if a small japanese woman drinks the same amount as a thirty-stone rugby player she will have a worse hangover...
thank god for research funding or the world might have never known!