The game is designed to show how hard it is under ‘normal’ circumstances for a sperm cell to reach and fertilise an egg cell. The idea is to race your sperm through the giant female reproductive tract to reach the egg and win.
1. The vagina is very acidic and the acid can kill a sperm in seconds.
2.The cervix is full of white blood cells that attack sperm because they recognise the cells as foreign
4. There are two fallopian tubes, but (usually) only one egg. Sperm are attracted to the correct tube by chemicals released from the egg.