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Most animals have a mating season at a certain time of year, and the spring is when most birds do. But it’s intriguing to think that, unlike most animals, humans seem to mate and have young sporadically.

But searching in birth patterns, lead us to finding that most birthdays seem to occur at certain times of year. For humans, the majority of births occur between July and September, with September being the most common birth month in the U.S. Do the math and you’ll discover this means these babies were conceived around the holidays.

So are the holidays the human mating season? Births peak two times a year, both around the holidays, as well as in late spring to early summer. It is known from the fact that this is when more children are conceived, more STDs are diagnosed and treated, and more condoms are purchased.

The sperm health is found to be best in late autumn and early winter, which may explain why so many pregnancies occur during this time of year.

Dr. Edmund Sabanegh, the chairman of the Urology Department at Ohio’s Cleveland Clinic, who was not involved in the study, said: “The hard part of this is really sorting out what factor is accounting for this.” 

A pattern with more sexually related searches occurring during the holidays and in early summer has also been noted in Google Searches by the researchers. And dating terms are also searched most often during these times, too.

According to psychology, it makes sense that, with the weather getting colder in late autumn and winter, we desire the physical warmth of a partner.

However, scientists are still skeptical about calling this a mating season. The reality is that humans have the ability to mate all year long. Women aren’t receptive to sex during these times, but many other times throughout the year. Also, their ovulation is not annually, but in every 28 days.

Many factors like temperature, length of daylight exposure, and hormone variation may be related with changes in seasonal sperm production. However, it seems sperm counts around the world are falling as a result of sedentary lifestyles and environmental contamination.

At the end, we may not have a very specific mating season like the birds, which makes sense considering we are very complex creatures, but if we had to try to better understand when the peaks are, taking into consideration environmental, social, biological, and psychological factors working together may explain our tendency to mate and conceive at certain times of the year.

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