To put it more clearly, it's not that this domain of human behavior is actually particularly irrational. In reality, it has its well-defined rules, and men who have the knowledge and ability to behave according to these rules are, at least in a libertine society such as ours, awarded with high status in the eyes of others -- and lots of sex, of course, if they choose to employ their abilities in practice. In contrast, men who are particularly bad at it suffer an extreme low status penalty; they are are a target of derision and scorn both privately and in the popular culture. However, what complicates the situation is that this is one of those areas where humans practice extreme hypocrisy, in that you're expected not just to navigate the rules of the game cleverly, but also to pretend that they don't exist, and to discuss the topic openly only with mystical reverence and unrealistic idealizations. Realistic open discussions are perceived as offensive and sacrilegious. It's an enormous bias.