A recent study led by Dr Alastair Sutcliffe, a paediatrician at the Institute of Child Health, in collaboration with Southampton University and researchers in Germany, has shown that boys conceived through a type of IVF called intracytoplasmic sperm injection (ICSI) tend to have shorter fingers than boys conceived naturally, which could be associated with lower fertility and reduced sexual attractiveness. It is known that men with low sperm counts often have ring fingers the same length as their index finger, whereas fertile men are more likely to have a ring finger which is relatively longer than their index finger. The opposite is true in women, as the most fertile are likely to have index fingers significantly longer than their ring fingers.