Here is an exploration of the commonalities and the striking differences between human and animal sexual behavior. 1. The Biological Foundation: Estrus vs. Menstruation
An animal doesn't need a bottle of wine, candlelight, and a negotiated conversation about STI testing before mating. A human often does.
Most animals mate primarily during specific fertile windows, often signaled by "heat" or observable ovulation. Humans, conversely, engage in "extended sexuality," mating throughout the menstrual cycle regardless of fertility.