The hot summer makes people wear less clothes and become more and more enthusiastic. A recent survey conducted by Britain's largest sex toy company showed that Britons had the most sex in August, followed by July and June.

Research from the Medical University of Grasse in Austria confirms this finding. Experts point out that the summer sunshine can increase the vitamin D content in the human body. The more vitamin D content in a man's blood, the higher the blood testosterone content, and the more orgasms he will have. Kari Cooper, a professor of psychology at Lancaster University in the United Kingdom, said that women can choose a variety of clothes in summer, which makes them feel sexier and may have more sex. A study conducted by scientists at the University of Southern Brittany in France also claimed that people are more likely to flirt when the sun is out. On a good day, women are more likely to reveal their phone numbers when they meet an attractive man.

The survey also found that the cold winter is the season when sex is most scarce, and people have the least amount of sex in the traditional "romantic February". Researchers say that in winter, the body contains more melatonin, which can lead to depression, lethargy and low libido.