According to Prof Frank Sommer, a researcher in Berlin, shopping might make men impotent.

(Seemingly a chemical compound, Bisphenol A (BPA), used to make ink visible on thermally sensitive paper, is present on some till receipts and the amount present can be high enough to suppress male hormones in the body. So now men have the perfect excuse not to go shopping, I’m sure they’ll find something dodgy in the washing up liquid next.)