This improves their odds of getting lucky again. Also, genes never forget a trick. Many of the most important ones in our bodies have not changed design in over 3 billion years. Mothers love their babies because those who didn t died out because they failed to protect their geans. People who can not love dogs or enjoy alcohol might die off if they are born at the wrong time or place.
Whole species are in compatision, just like individuals and genes.
If wolfs ate wolfs, none of them would have made it. Males are like criminals too. Sperm are similar to virus. Sex is evolution s brain in that it lets it try all the possibilities. Because the female contributes more she has more invested in the survival of the offspring.