https://www.discoverwildlife.com/animal-facts/mammals/why-do-lions-take-so-many-sexual-partners/#

"I was surprised to discover the licentious nature of the female lion. At university I was taught that males, with their bountiful supply of cheap sperm, are wired for promiscuity whereas females, with their limited number of costly eggs, must be choosy and chaste. Someone clearly forgot to inform the lioness of this 'universal law'.

The main problem with this neat classification is, it’s wrong. We now understand that females from species as diverse as langurs, lizards and lobsters employ a wanton sexual strategy of multiple mating. Female promiscuity increases the chances of genetic or immune compatibility, which results in healthier offspring.

When fertile, their main weapon is sex. Mating with multiple males, inside and outside the pride, confuses paternity and deters any incoming males from infanticidal behaviour."