The slightly scary thing is this research also shows that beer really does contain female hormones. These plant derived hormones are called phytoestrogens and are similar to human oestrogen. Perhaps that explains why male beer drinkers are prone to developing man-boobs.
Yeah, I know there are plenty of sexist jokes out there on this theme. If you haven't seen any just type "beer female hormones" into Google to find them.....but I didn't tell you to do it, OK?