Why, then, does sex exist? In his 2001 book, Evolution: The Triumph of an Idea, Carl Zimmer admitted:
‘Sex is not only unnecessary, but it ought to be a recipe for evolutionary disaster. For one thing, it is an inefficient way to reproduce.... And sex carries other costs as well.... By all rights, any group of animals that evolves sexual reproduction should be promptly outcompeted by nonsexual ones. And yet sex reigns... Why is sex a success, despite all its disadvantages?’[31] [emp. added].
From an evolutionary viewpoint, sex definitely is “an inefficient way to reproduce.” Think about all the sexual process entails, including the complexity involved in reproducing the information carried within the DNA. It is the complexity of this process, and the manner in which it is copied from generation to generation, which practically drove Mark Ridley to distraction in The Cooperative Gene.
‘No one in human culture would try the trick of first making two copies of a message, then breaking each into short bits at random, combining equal amounts from the two to form the version to be transmitted, and throwing the unused half away. You only have to think of sex to see how absurd it is. The “sexual” method of reading a book would be to buy two copies, rip the pages out, and make a new copy by combining half the pages from one and half from the other, tossing a coin at each page to decide which original to take the page from and which to throw away’[32] [emp. added].
Again, from an evolutionary viewpoint, sex would be considered “absurd.” But from a design viewpoint, it is nothing short of incredible!
http://www.trueorigin.org/sex01.asp