1) Accessibility 2) Approachability 3) Interest 4) Openness 5) Receptiveness 6) Willingness 1) Openness 2) Receptiveness 
• (n.) The power or capacity of receiving impressions, as those of the external senses. • (n.) The state or quality of being receptive.
Rec`ep·tiv'i·ty (rĕs`ĕp*tĭv'ĭ*tȳ or rē`sĕp- ) noun [ Confer French réceptivité .] 1. The state or quality of being receptive. 2. (Kantian Philos.) The power or capacity of receiving impressions, as those of the external s...
(Lat. recipere, to take back) The collective name for receptive or sensory functions of the mind in contrast to its active or motor functions. In the Kantian terminology, receptivity is defined as the faculty of receiving representations in contrast to spontaneity, the faculty of knowing an object by means of concepts. See Kant, Critique of Pare R....
When the female starts becoming receptive to the male and is ready to breed.