Just wanted to add another bizarre theory I heard.... Apparently it's all in the water! I forget where I read it, but apparently, the number of women using the pill means there is a larger amount of female hormones being deposited into the water supply which is not removed by water treatment works. Therefore, people drinking water are taking small amounts of hormones whenever they drink water from the tap!
There are so many theories out there, but personally I'm inclined to believe it is just more open due to the internet. Before such wonderful forums as this one existed, very few people knew more than a couple of others who felt the same way, now with such availability, we all know (or know of) many such people. Newspapers, universities and other research institutes also research online and will obviously see greater prevalence as more sites show up and member numbers continue to increase.
Right, that's my two pence worth, I'm off for a couple of pints of tap water!!