Japanese adults can't get enough satisfaction, and Austria's mojo is working.
Researchers at the University of Chicago say 71 percent of Austrians report being satisfied with their sex lives.
Japan comes in last among the 29 nations studied at 26 percent.
Spain, Canada, Belgium and the United States also reported high rates of satisfaction.
The report suggests sex is more satisfying in countries where women and men are considered equal.
The sociologist leading the survey says male-centered cultures tend to discount the importance of sexual pleasure for women.
As he put it, "When mama's not happy, nobody's happy."
The study, sponsored by Viagra maker Pfizer, is in the April issue of the Archives of Sexual Behavior.