Host Craig Benzine of Mental Floss answers a user submitted question, “Why don’t humans have a mating season?”
Benzine explains the differences between an estrous cycle that animals experience and a menstrual cycle that women go through. With an estrous cycle, the endometrial lining is re-absorbed if conception doesn’t occur. With humans, the endometrium sheds if fertilization did not happen. Are there any differences between animal and human sexual behavior? And what is Benzine’s theory of human mating cycles.
Source: Mental Floss