Many people find the unwritten rules of etiquette in flirting difficult to follow. The Natural History Museum had an exhibition called ‘Sexual Nature’ in which they taught humans, from the wealth of knowledge accumulated from research by zoologists, how to flirt effectively.
The peacock’s tail is a famous example of sexual selection. The male possessing the largest and most colourful tail will win the ladies, because it’s a sign the male is fit and healthy and his genes will ensure the survival of her offspring. In the wild, the males of many species have flashy colours while the females are drab. Perhaps human males need to be more gaudy.