How often is the most appropriate time to have sex? This is probably a question that many people have had. In this regard, American scholars have summarized a "sex frequency formula" based on the influence of age factors on sexual ability-sex frequency = the first digit of age × 9.

Multiply the tens digit of your age by 9. The tens digit of the product is the number of days a sexual cycle lasts, and the units digit is the frequency of sexual intercourse.

How to calculate the frequency of sex between 20 and 79 years old

Age algorithm frequency

20 to 29 years old

2×9=18< /p>

8 times in 10 days

30-39 years old

3×9=27

7 times in 20 days

40-49 years old

4×9=36

6 times in 30 days

50-59 years old

5×9= 45

5 times in 40 days

60-79 years old

6×9=54

4 times in 50 days

According to the American "Women's Health" magazine, this formula is suitable for adults over the age of 20. For example, for a 25-year-old person, his or her sexual intercourse formula is 2×9=18. 18 is a combination of 10 and 8. That is to say, the appropriate sexual intercourse frequency for him or her is 8 sexual intercourses in 10 days. More than this frequency is too frequent and may cause physical discomfort.

Regarding this formula, Yang Dazhong, Department of Sexual Medicine, Yuquan Hospital, Tsinghua University, said that although the formula is relatively rough, the calculated results have a certain scientific nature and can be used as a reference. The content of sexual life includes masturbation, sexual dreams, caressing and other methods. They can all bring orgasm experience and should also be included in the frequency of sexual intercourse. In real life, the frequency of sex between couples is closely related to their relationship, life, work, and health. The most appropriate frequency is the state in which both parties feel the most harmonious.