Lead Kinsey Institute researcher, Julia Heiman, and her team questioned over 1,000 couples from the United States, Brazil, Germany, Japan and Spain, between the ages of 40 and 70, who had either been married or were living together for at least a year, with the average relationship span being 25 years.
Of these couples, Japanese and Brazilian women were "more likely than U.S. women to report being sexually satisfied," while "middle-age men in Japan reported 2.61 times more sexual satisfaction in their relationships" than U.S. men did.
Most interesting, the men reported cuddling, caressing, kissing and tenderness to be more important to their relationship happiness than women did. They were also happier in their relationships if they were in good health and could bring their partner to orgasm.
Women, on the other hand, based their relationship happiness on the sexual relationships they had with their partner; the study found women were more satisfied with their sex life the longer they were together with their partner.
However, both men and women "were more satisfied with their sexual relationship if they had sex more frequently, had higher sexual functioning and kissed and cuddled frequently."
Just another reason to get it on with your boo more frequently.