My favorite sentence in the following interesting article is this:

“The coevolutionary struggle between hosts and their parasites could explain the existence of males.”

Finally! I now have an explanation for the vexing puzzle of my very existence, which has kept me awake … well … not at all.

“Cross-fertilisation helps creatures stay a step ahead in the continuous “arms race” with parasites, which are forever evolving to try and infect them.

“Biologists have described the situation as “Running with the Red Queen” in reference to the character in Lewis Carroll’s Through the Looking-Glass, who tells Alice: “It takes all the running you can do, to keep in the same place.”

“Despite the popularity of the theory, there has until now been little solid evidence to support it.

“But experts at the University of Indiana may have provided the best evidence yet after engineering two types of worms, some which could only reproduce by mating with each other and some could only clone themselves.”

Read full article: “Scientists discover the point of sex”

Or, you might want to consider the following theory: