According to Japan's Kyodo News Agency, a questionnaire survey released by the Japan Family Planning Association, which carried out "whoo" education and infertility counseling on the 20th, showed that 42% of Japanese men aged 20~29 said that "there is no experience of having a whoop with the opposite sex".

The percentage of women in the same age group who answered "no" was 21%, which is half that of men. Kunio Kitamura, executive director of the association, said, "In the context of male herbivory men, it is shocking that the difference between men and women in their 20s is so significant. ”

In December 2013, the association sent out the above questionnaire to about 100,000 men and women aged 20~69 across the country by e-mail, and counted about 5,000 people who responded. Among the 30~39-year-old men, 10% of them answered "no "whoosh" behavior, and 7% of women of the same age, the gap has narrowed, and there is almost no difference between men and women in the upper age group. In addition, 31% of men and 34% of women did not live in the last month. 28% of men said they had no partner, while 25% of women said they found it troublesome. The percentage of married people who answered that they "find it troublesome" is the highest among both men and women, and Kitamura says that this is probably one of the reasons for the declining birthrate.