People who do not understand that the same biological species cannot have different breeding strategies in males and females.

What about the lions, for example? Prade consists of one male and many females. The females do not deceive him, but the male of each of them deceives with all the others in turn.

The main function of the lion is to produce offspring and protect it from other males. From time to time, the same other males enter the territory (the lion cautiously drives out his sons), and if they kill the master, the lions will also be drowned, and the females, not for a long time, will begin to mate with the winner and give birth to him.
So the only thing that ensures the loyalty of the lions is the absence of an alternative. As in other "harem" types. Moreover, some single males manage to fertilize a female in the harem of the great and powerful without a fight, with a quiet shoe, while the one is occupied with the favourite.
In truly monogamous species, which are few, let at least twenty individuals of the opposite sex walk and take nasty poses - neither male nor female will do well.