@Leadfoot,
Your statement is pure nonsense.
1. sex wasn't "invented"
2. You make the false assumption that one creature always has a survival advantage over another.
3.You make the false assumption that survival equates to a better and simpler answer.
4.There are no such thing as "evolutionists". That is simply your attempt to slander people that agree with the scientific theory of evolution.
5.People that agree with the theory of evolution don't need to invoke "intelligence" to explain how random mutation works.
You might want to look up parthenogenesis.