They said hormone treatments such as tibolone (Livial) which used male sex hormones called androgens, rather than female hormones, were more successful in increasing libido.

BBC: Sex a turn-off for many UK women

For example, one way to track the reproductive cycle in a female is to follow the waxing and waning of sex hormones.

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These hormones include cortisol (which is related to stress), estradiol (the main female sex hormone) and prolactin (which, as its name suggests, triggers her breast tissue to develop the ability to secrete milk).

ECONOMIST: Hormones and fatherhood