[rwmhzrir] Cosmo versus anti-Cosmo game theory

The traditional narrative goes, the female reads Cosmopolitan magazine, and uses the techniques described therein to be good in bed, to feign enthusiasm and interest in sex, to successfully seduce the male.  After the male has "put a ring on it", thus contracted into marriage, she becomes no longer interested in sex: I'm too tired, I have a headache, etc.

If this narrative is true, then there should be strong game-theoretic response.  After all, this is the mating game, a matter of much greater than life and death (viz., the life and death of all of your descendants until the end of time!).  There should be equally serious "anti-Cosmo" observation, wherein the male tries to discern whether the female is merely feigning interest in sex or is genuinely interested, and will continue to be so after marriage.  I see very little information-sharing of such indicators.

There could be many reasons why, ranging from the easiness of divorce or adultery, it's actually impossible to fake the whole experience (despite Sally and Harry).