The periodic state of sexual excitement in the female of most mammals, excluding human beings, that immediately precedes ovulation and during which the female is most receptive to mating, heat.

• （雌性动物的）动情，动情周期大多数哺乳动物（包括人类）的雌性产生的周期性的性冲动，在此期间内雌性具有排卵的优势，所以该期间最适合性交,刺激