This is absolutely correct. Quick recombination so that a beneficial gene can spread without losing genetic diversity of the population is is one of the benefi

This is absolutely correct. Quick recombination so that a beneficial gene can spread without losing genetic diversity of the population is is one of the benefits of sexual reproduction. And immune resistance to new threats is one of the top reasons why we need this capability. In fact we broadcast signatures of our immune systems in pheromones and women are attracted to the smell of men whose immune systems are different from their own. This improves the probability that the children will be resistant to a wider range of possible diseases. https://en.wikipedia.org/wiki/Body_odour_and_sexual_attraction https://en.wikipedia.org/wiki/Body_odour_and_sexual_attracti... is one of many places that you can start learning more about this topic.