>>12557181Sexual reproduction is just a mechanism to filter mutations from the gene pool, involving mixing and filtering.
The gene mixing provides a chance of having offspring with a low mutation load. The filtering (inceldom) is how nature kills offspring with a high mutant load.
Imagine two horrible mutants having 12 kids. By a stroke of statistical luck, 1 kid came out fine, the other 11 are as bad or worse than the parents. That good kid will get to reproduce.