Evolutionists are puzzled by the male and female sexes. They do not know how they came to be. They guess that when life first started billions of years ago, male and female did not exist, and that the sexes evolved later as life got more complex. This means that mutations (i.e. errors) gave rise to the sexes according to evolution theory.
If you study the human male and female reproductive systems, you will see that they are amazingly complex and complementary. How is it that such fine-tuned systems that work perfectly together originated from a series of errors? It makes no sense.