In the natural world, among the same species, the costs of reproduction between individuals of different genders vary.
The female side often has to devote a lot of time and energy to nurturing its offspring. To say nothing of other aspects, reproductive activities alone take away some nutrients from the mother.
For the male side, reproduction is usually just a low-consumption, simple activity, which benefits quickly spreading branches but leads to intense competition among males.
To pass on their genetic material, both genders engage in a game.
Seahorses giving birth, mandarin ducks forming pairs, mantis eating mates, etc., are all results of gender game theory.
The birth of paternal and maternal love is also one of the consequences of gender game theory.
