Some people criticize that evolutionary biology is at best a conjecture, but the fact is the opposite. Evolutionists have given clear answers to many inexplicable phenomena in anatomy, physiology, embryology, and behavior. However, there are still some puzzles that cannot be solved. One of the most prominent is the evolution of homosexuality. The question itself is not complicated, but our best scientists have yet to find the answer.
The necessary condition for any trait to evolve is that the trait is positively related to the success of reproduction. More precisely, the trait should be conducive to the continuation of related genes in the future. Therefore, if homosexuality is a product of evolution—obviously it is, and the reasons will be explained below—then genetic factors associated with homosexual preference must have some advantage in reproduction. In this way, the problem is obvious: Since homosexuals produce fewer offspring than heterosexuals, why did natural selection not eliminate the trait of homosexuality?