Sex, lies and monogamy: “At the heart of all
long-term relationships lies a fundamental
deception — women only stay with men for security,
and men only stay with women for sex. It’s a
cynical view of human relationships, but
researchers now say it is the driving force behind
the evolution of monogamy–and women started
it. By offering sex all the time, females in
monogamous species disguise whether they are
fertile and trick males into sticking around.” New Scientist