Why can humans be in estrus all the year round?

First of all, estrus is the time when animals begin to estrus. Estrus is coming, and sexually mature animals have certain physiological characteristics. They secrete certain hormones to stimulate animals to have sexual desire, but different animals have different physiological characteristics.

The estrus of animals is related to the survival rate of animals in this season. Some small mammals have strong viability, so their estrus is many times a year, and each time is very short. For example, mice give birth several times a year and give birth to 5-6 babies at a time. The estrus of some fur animals is closely related to sunshine and temperature, and the nutritional level of feed is related to management technology, variety, age and individual factors. The reason why people have no fixed estrus period is partly because people's living conditions are too superior to control this aspect.

In apes, estrus does not occur according to the season, but on certain days of the menstrual cycle. At other times, they are not in heat, while humans are constantly evolving. During the ape-man period about 6.5438+0 million years ago, estrus gradually disappeared, but human beings still had traces of estrus. For example, human women may have stronger sexual desire on some days of menstrual cycle, while male estrus cycle has completely disappeared.

The disappearance of estrus has had a certain impact on human beings. After puberty, human sexual organs enter a mature stage. Human beings have a certain degree of sexual knowledge, but after being controlled by their clever brains, they will produce certain hormones when stimulated. It is for this reason that human beings can only have sexual desire when they need it, or when they are stimulated by the outside world, so the total amount of human sexual activity far exceeds that of any animal. It is precisely because of this feature that we can always see some people being laughed at in estrus or because of estrus, thus creating the illusion that human beings are in estrus all year round.