Innate behaviours are often regulated by complex interwoven mechanisms that integrate the internal state of the animal and external stimuli that it encounters in the environment. Female sexual behaviour is a good example of such a behaviour, where the internal state of the female, defined by the phase of the reproductive cycle she is in, determines how external stimuli, such as cues she receives from a male attempting to copulate
with her, are processed. While during the receptive phase of the reproductive cycle the female accepts a male’s attempts at copulation, during the non-receptive phase she rejects them.