Sperm are small and bountiful, whereas eggs are large and limited; so males will be promiscuous and females will be choosy and chaste. ‘Excess copulations may not actually cost a female much… but they do her no positive good. A male on the other hand can never get enough copulations with as many different females as possible: the word excess has no meaning for a male,’ explained my tutor, Richard Dawkins, in The Selfish Gene.
