Sperm crash into walls and each other as they race to the egg

Sperm have 'an appalling sense of direction' crashing into walls and each other in race to the egg | UPDATED: 19:06 GMT, 7 May 2012 Fertility doctors have long puzzled why only one per cent of the 300million sperm released by a man during sex manages to reach their partner's uterus, while just a few dozen reach the egg.