What is the main advantage of sexual reproduction

hey

More variation assists with survival. It increases th chance that at least some offspring of a parent survive. It creates genetic diversity within the species. It is a rewarding experience. It can encourage the growth of brain cells. It improve health.

Diversity. The more diverse a species, the better its chances of survival are, and with sexual reproduction an organism isn't essentially duplicating itself, so it's forced to expand its gene pool.