Nationally representative data on sexual health and behaviors in Japan are scarce. We
conducted an online survey, including questions about a range of topics related to sexual …

Continued decrease in smoking prevalence and increasing use of sensitive diagnostic
procedures necessitate updated monitoring of trends in lung cancer incidence in Japan. We …

Background While fertility rates have decreased during the second half of the 20th century in
Japan, little is known regarding trends in the number of children that men and women have …

Many people believe that “living happily ever after” involves finding a romantic partner.
Regardless, it seems obvious that at least some single people are happier than some …

With both theories and empirical studies supporting the benefits of having a romantic
relationship, there remains an increasing tendency of staying single being documented …

Low fertility is a growing concern in modern societies. While economic and structural
explanations of reproductive hindrances have been informative to some extent, they do not …

Objective: Our study analyses the relationship between employment conditions and non-
coresidential partnership status among women and men in two very-low fertility countries …

The literature on marriage formation neglects different pathways to marriage. This study
focuses on arranged marriage, introduced marriage, and self-initiated marriage as three …

STUDY QUESTION How did the sexual frequency change and what are the related
influencing factors among infertile Chinese couples over the past 10 years? SUMMARY …

Modern low fertility is an unresolved paradox. Despite the tremendous financial growth and
stability in modern societies, birth rates are steadily dropping. Almost half of the world's …